Electromagnetic locks for cabinets are an important and widely used device in modern security. Based on unique electromagnetic principles, they provide efficient and reliable security for cabinets. The design principle of an electromagnetic lock is based on the attraction and release of an electromagnet. When current flows through the electromagnet, a strong magnetic force is generated, firmly attracting the latch to the lock body, thus sealing the cabinet door. When the current is cut off, the magnetic force disappears, and the latch automatically pops out, allowing the cabinet door to be easily opened. electromagnetic lock for cabinet China Kerong is a professional manufacturer and wholesaler of electromagnetic locks. Kerong electromagnetic locks are widely used in various storage cabinets and intelligent storage cabinets. Electromagnetic locks have many advantages. First, they offer extremely high security. Because the latch of an electromagnetic lock is firmly attracted when energized, it is almost impossible to pry it open by external force, effectively preventing illegal intrusion and theft. Second, electromagnetic locks are simple and quick to operate. Opening and closing the cabinet door can be achieved simply by controlling the on/off state of the current, eliminating the need for traditional keys and greatly improving ease of use. Furthermore, electromagnetic locks are characterized by long lifespan and low maintenance costs, enabling long-term stable operation and saving users considerable time and effort. In terms of application, electromagnetic locks for cabinets are widely used in various security situations. For example, in filing cabinets and document cabinets in public places such as offices, schools, and hospitals, electromagnetic locks ensure the safety of important documents and data. In home environments, they can also protect valuables and private spaces, providing additional security for family members. Furthermore, with the rise of smart homes, electromagnetic locks can be connected to smart home systems for remote control and intelligent management, further enhancing convenience and security. Of course, users also need to pay attention to some factors when choosing electromagnetic locks for cabinets . Among the many clients we work with, we generally need to know the dimensions and weight of their cabinets in advance to select the appropriate electromagnetic lock model, ensuring it can withstand the weight of the cabinet door and remain stable. Kerong electromagnetic locks are stable, safe, and reliable. In short, electromagnetic locks for cabinets are a highly efficient and reliable security device. Kerong looks forward to cooperating with more excellent companies worldwide. We have an independent, large-scale intelligent manufacturing plant that can ensure the delivery of large quantities of locks. We look forward to your feedback and cooperation.

Intelligent locker control systems are widely used around the world and are becoming increasingly popular. As a source supplier of intelligent locker control systems, Kerong welcomes companies with specific needs to cooperate with us. Here are some application scenarios for our intelligent locker control systems: intelligent locker control systems 1. Shopping Malls: In shopping malls, intelligent lockers provide customers with convenient storage services. Customers can store their packages, clothing, and other items in the lockers for easy shopping. Meanwhile, mall administrators can monitor locker usage in real time through backend management software, promptly identifying and handling any issues. 2. Schools: intelligent lockers in schools provide students with a safe storage space for their belongings. Students can store books, stationery, sports equipment, and other items in the lockers to prevent loss or damage. Furthermore, schools can manage lockers by grade, class, or major for easier student use. 3. Gyms: In gyms, intelligent lockers provide members with dedicated storage services. Members can store clothing, shoes, gym equipment, and other items in the lockers for convenient exercise. Meanwhile, gym administrators can use backend management software to statistically analyze locker usage, understand members' habits and needs, and provide better services. 4. Factories， intelligent lockers in factories can provide employees with safe storage space for tools and belongings. Employees can store work clothes, safety helmets, tools, and other items in the lockers, preventing loss or disarray. Furthermore, factories can use intelligent locker control systems to manage tool issuance and return, improving tool utilization efficiency and management levels. Of course, there are many other application scenarios. Currently, with continuous technological advancements, intelligent locker control systems will continue to develop and improve. In the future, intelligent locker control systems will become more intelligent and user-friendly, possessing more functions and services. For example, the system may integrate with mobile internet technology to enable remote booking and online payment; it may adopt more advanced recognition technologies, such as iris recognition and voiceprint recognition, to further improve system security and reliability; and it may combine with big data and artificial intelligence technologies to achieve intelligent analysis and prediction of user behavior, providing users with more personalized services. In the future, intelligent locker control systems will be widely used in many places.

The intelligent locker control system is a modern storage management system integrating electronic technology, computer technology, automatic control technology, and intelligent identification technology. It eliminates the cumbersome traditional locker system using keys or paper vouchers, instead employing more advanced and intelligent identification and control methods to achieve automated and intelligent management of the lockers. Users can quickly and securely store and retrieve items with simple operations, greatly improving storage efficiency and ease of use. Intelligent Locker Control System China Kerong is a global supplier in the field of intelligent locker control systems. We have completed the development and application of intelligent locker control systems in more than ten countries around the world. Now, we will introduce the structural components of an intelligent locker control system: 1. Hardware Components of the Intelligent Locker Control System: a. Locker Body. This is the physical carrier of the system, typically made of high-quality steel, possessing excellent sturdiness and durability. The interior of the locker is designed with multiple compartments of varying sizes to meet the storage requirements of different items. Each compartment is equipped with an independent door lock to ensure the safe storage of items. Kerong can freely customize the design of different lockers, including the locker material. b. Control Terminal. Generally installed in a prominent position within the locker, this is the primary interface for user interaction with the system. The control terminal typically uses a touchscreen design, offering simple and intuitive operation. Users can perform operations such as storing, retrieving, and searching items via the touchscreen, while also viewing relevant system prompts. c. Identification Devices. This is one of the core components of the intelligent locker control system. Common identification methods include card swiping, fingerprint recognition, facial recognition, and QR code recognition. Different identification methods have different characteristics and applicable scenarios. For example, card swiping is simple to operate and low-cost; fingerprint and facial recognition offer high security and uniqueness; QR code recognition is convenient and fast, suitable for today's widespread use of mobile devices. d. Main Control Module. As the "brain" of the system, the main control module is responsible for receiving signals from the identification devices and processing and analyzing them. Based on the processing results, the main control module controls the corresponding locker door lock to open or close, and also records the operation information for later retrieval and management. e. Communication Module. Used to enable data communication between the control terminal and the main control module, and between the main control module and the back-end management system. Through the communication module, the system can upload operational data in real time and receive instructions from the backend management system, enabling remote monitoring and management. 2. Software Components of the Smart Locker Control System: a. Control Terminal Software: Installed on the control terminal, providing a user-friendly interface. Users can use this software to perform basic operations such as storing, retrieving, and searching items, and can also set personalized parameters such as language selection and volume adjustment. b. Backend Management Software: Running on the server, this is the core of the entire system's management. The backend management software can monitor the usage of the lockers in real time, including locker door status, item storage status, and user operation records. Administrators can use the backend management software to perform user management, permission settings, data statistics and analysis, achieving comprehensive management and maintenance of the lockers. Working Principle of the Smart Locker Control System: When a user needs to store items, they first select the "Store" button on the control terminal, and then follow the system prompts to select the appropriate recognition method (such as card swiping, fingerprint recognition, facial recognition, or QR code scanning). After the system verifies the user's identity information, the main control module randomly assigns an available locker and unlocks the door. The user places their items into the locker and closes the door; the system automatically records the locker's usage status and the user's information. When the user needs to retrieve their items, they select the "Retrieve" button on the control terminal and use the same identification method for authentication. After successful verification, the system locates the corresponding locker based on the previously recorded user information and unlocks the door. After the user retrieves their items and closes the door, the system updates the locker's status to "Available." Currently, the Kerong intelligent locker control system automates the storage and retrieval of items. Users no longer need to carry keys or paper vouchers; they can complete the process with simple identification, significantly saving time and effort. The efficiency and convenience of intelligent lockers are particularly evident in high-traffic areas such as shopping malls and train stations. We welcome companies with such needs to cooperate with us. We provide not only intelligent locker control systems but also complete solutions including intelligent locker bodies, intelligent locks, and intelligent management systems.

Kerong China: A Professional Wholesaler of Hidden Locks Hidden locks, with their unique design and excellent security performance, have gradually become the preferred choice for many venues and users. As a professional wholesaler of Hidden locks, Kerong China has established a strong reputation in the industry thanks to its extensive product range, reliable product quality, and excellent service. Hidden switch lock Kerong understands that different customers have different needs for Hidden locks , and therefore is committed to providing a wide variety of product choices. Whether it's ordinary Hidden locks suitable for residential homes, with their simple and stylish design that blends perfectly with various decorating styles, ensuring home security without compromising aesthetics; or high-end Hidden locks for commercial venues, featuring higher security levels and more complex unlocking methods, such as fingerprint recognition, password unlocking, and card unlocking, meeting the stringent requirements of personnel access management and security in commercial establishments. Furthermore, for special venues such as banks and museums, Kerong also provides customized Hidden lock solutions, designing unique products based on the specific needs and characteristics of the client's location to ensure targeted and effective security protection. Product quality is the cornerstone of a company's survival and development. Our company rigorously selects suppliers, using only high-quality materials to ensure that every Hidden lock is sturdy and durable. During production, we employ advanced manufacturing processes and a strict quality control system. From component processing to complete lock assembly, every step is meticulously controlled to ensure stable and reliable product performance. Furthermore, Kerong emphasizes product innovation and research, continuously investing resources in technological improvements and new product development to maintain our industry-leading position. After years of market testing, Kerong's Hidden locks have earned widespread customer trust and praise for their superior quality. In recent years, we have built a new intelligent manufacturing plant in Huizhou, China, to meet the large-scale production and shipment needs of Hidden locks for global customers. We welcome outstanding companies worldwide to cooperate with Kerong and accept OEM and ODM orders. We also welcome companies in the electronic smart lock market to collaborate with us.

Kerong China - A Supplier of Concealed Locks: An Invisible Guardian in the Security Industry In today's rapidly developing smart home and security industry, concealed locks, with their strong concealment, high security, and aesthetically pleasing design, are gradually becoming the preferred security solution for homes, offices, and commercial spaces. As a professional manufacturer in this field, Kerong Industrial Co., Ltd. (hereinafter referred to as "Kerong") has become a benchmark supplier in the global concealed lock industry, thanks to over 20 years of technological accumulation and market cultivation. Concealed switch lock factory supplier-kerong 1. Technological Accumulation: A Leap from Mechanical Locks to Smart Security Founded in 2002, Kerong is one of the earliest companies in China to engage in the research and development of smart locks. Initially based on mechanical lock structures, the company gradually integrated electronic drive technology to develop its first-generation concealed electromagnetic lock, applied in vending machines, logistics cabinets, and other scenarios. With the popularization of biometric technology, Kerong launched the "Meidun" series of concealed safes in 2012, integrating fingerprint recognition, 24K gold plating, and anti-pry alarm functions, pioneering the intelligentization of home security products. As of 2025, Kerong has over 50 independent intellectual property rights, including more than 20 national utility model patents and 2 invention patents. Its products have passed ISO9001 quality management system certification, CE, FCC, RoHS and other international certifications, and its technological strength ranks among the top in the industry. 2. Product Matrix: Full-Scenario Coverage of Hidden Lock Solutions Home Security Series : KR-NFC-CL5126 Passive NFC Smart Cabinet Door Lock, using 13.56MHz RFID technology, supports triple unlocking methods including mobile phone NFC, IC card and password, suitable for home cabinets, drawers and other scenarios. Its hidden design requires no drilling, making installation convenient, and it features low-voltage alarm and anti-pry locking functions. KR-S80A Metal Smart Hidden Storage Lock, designed for high-end homes, is made of zinc alloy and supports triple unlocking methods including fingerprint, password and mechanical key. Its ultra-thin body (only 12mm thick) can be perfectly integrated into furniture, and with an OLED screen and voice navigation, operation is intuitive. Commercial Security Series : The KR-210 electronic combination lock, developed for office security cabinets and filing cabinets, supports hidden touch password input and allows for multiple unlocking modes including single password, multiple passwords, and fingerprint + password. Its ABS environmentally friendly flame-retardant shell and zinc alloy lock tongue have passed extreme environmental testing from -15℃ to +65℃, demonstrating industry-leading stability. The KR-S99N DC solenoid valve lock is used in vending machines, parcel lockers, and other scenarios. It supports 12V/24V DC power supply, has an unlocking response time of ≤0.5 seconds, and features a waterproof and dustproof design (IP65 rating), making it suitable for harsh outdoor environments. Industrial security series . High-security electromagnetic door locks, featuring a 600lbs (approximately 280kg) suction force design, support sliding metal/wood/glass doors and are widely used in gym lockers, gun cabinets, and other scenarios. Its hidden installation method and magnetic lever handle design balance security and aesthetics. Faced with the explosive growth of the smart home market, Kerong is accelerating its expansion in the AIoT field. Its new generation of concealed switch locks will integrate AI visual recognition and Bluetooth Mesh networking technology, supporting integration with smart speakers and security cameras to build a whole-house smart security ecosystem. Kerong hopes to collaborate with outstanding companies worldwide to jointly develop the concealed switch lock market. We believe that Kerong's electronic smart lock technology will bring a perfectly compatible smart lock market to our partners. We look forward to your comments and cooperation.

Hidden locks are an innovative type of lock. Kerong, a leading global manufacturer of Hidden locks, introduces the features of Hidden locks: 1. Unique and Cleverly Hidden Design The biggest feature of Hidden locks lies in their "concealment." Unlike traditional surface-mounted locks, they cleverly hide the lock body inside the door or object, making them almost imperceptible from the outside. This design not only gives the door or object a cleaner and more aesthetically pleasing appearance, enhancing the overall quality of the space, but also avoids the scratches and collisions that can occur with exposed parts of traditional locks, extending the lifespan of both the lock and the door. For example, on the entrance doors of some high-end residences, Hidden locks blend perfectly with the door's material and color; the lock's location is virtually undetectable without close inspection, making the entire entrance area appear grand and sophisticated. Hidden switch lock 2. Diverse Types of Hidden Locks to Meet Diverse Needs Hidden locks come in a wide variety of types to meet the needs of different scenarios and users. Common types include electronic and mechanical Hidden locks. Electronic Hidden locks typically incorporate advanced electronic technology, offering multiple unlocking methods such as fingerprint recognition, password input, card swiping, and remote control via mobile phone. Users can choose the appropriate unlocking method according to their habits and needs, greatly improving ease of use. Furthermore, electronic Hidden locks also feature a security alarm function, promptly sounding an alarm to alert users to security risks in case of unauthorized unlocking or abnormal situations. Mechanical Hidden locks, on the other hand, are favored by some users for their stable and reliable performance. They do not require power supply, achieving unlocking and locking functions through a mechanical structure. Mechanical Hidden locks are a good choice for locations with unstable power supplies or where users are unfamiliar with electronic equipment. 3. Hidden Locks Offer Impenetrable Security Security is the core function of locks, and Hidden locks excel in this regard. Their Hidden design itself increases security, making it difficult for criminals to find the key unlocking points. At the same time, both electronic and mechanical Hidden locks utilize high-strength materials and advanced manufacturing processes, possessing anti-pry, anti-sawing, and anti-drilling characteristics. Electronic Hidden locks utilize fingerprint recognition technology, ensuring uniqueness and preventing replication. Only authorized fingerprints can open the lock, significantly enhancing security. The password input function also employs encryption technology to prevent password cracking. Mechanical Hidden locks feature a complex lock cylinder structure and unique key teeth, making them difficult to counterfeit and effectively protecting user security. 4. Hidden locks are easy to install and widely applicable. Installation of Hidden locks is relatively convenient. Professional installers can quickly complete the installation work according to different door structures and user needs. Furthermore, it is suitable for various types of doors, such as wooden doors, metal doors, and glass doors. Hidden locks can be installed in homes, office buildings, hotels, and shopping malls. In places with high security requirements, such as banks and jewelry stores, Hidden locks have become the preferred security equipment. Therefore, Hidden locks bring convenience and security to people's lives and have also promoted innovation and development in the lock industry. It is believed that Hidden locks will become even more widespread in the near future. As a source manufacturer of electronic smart locks, Kerong meets global order needs. Last year, we built a new smart factory in Huizhou, China, to ensure the quality of every Hidden lock. Kerong welcomes OEM and ODM orders and welcomes you to contact us for discussions.

From corporate offices and educational institutions to logistics centers and fitness facilities, the intelligent storage solutions have become indispensable. Smart lockers have revolutionized how we store, secure, and manage personal belongings across various industries. At the heart of every smart locker system lies a sophisticated ecosystem of components working in perfect harmony. Today, we'll explore the essential elements that make smart lockers function seamlessly, with a special focus on KERONG's innovative electronic locker locks and control systems. Core Components of Smart Locker Systems 1. Electronic Locker Locks: The Foundation of Security At the core of any smart locker system are the electronic locks themselves. KERONG offers a comprehensive range of electronic locker locks designed to meet diverse application requirements: KR-S98 Series Waterproof Electronic Locks These IP66-rated locks feature 430 stainless steel construction and are designed to withstand extreme weather conditions. Operating at 12V/24V with a power consumption of just 28W, these locks offer exceptional durability with a working life of 500,000 cycles. The built-in push block mechanism ensures reliable door opening, while the mechanical emergency lever provides manual unlocking capability during power outages. KR-S70/S79 Series Rotary Latch Locks These compact rotary latch locks offer superior performance with minimal power consumption (0.72W-0.96W). Available in multiple sizes, they feature adjustable revolution speeds and are suitable for various locker applications from office cabinets to parcel delivery systems. Key Features Across KERONG's Lock Portfolio: Multiple unlocking methods: Password, RFID, Fingerprint, and Bluetooth Weatherproof construction for outdoor applications Low power consumption for battery-powered applications Customizable wire configurations and connectors Integration with emergency release mechanisms 2. Control Systems: The Brain Behind the Operation KERONG's intelligent control systems serve as the central nervous system of smart locker installations. Their controllers feature advanced microprocessor technology and multiple communication protocols. KR-CU Series Control Units These sophisticated controllers feature STM8S103K3T6 microprocessors and support both TCP/IP and RS485 communication protocols. With dimensions of 200×140×15mm and operating voltages of 12-24V, these units can manage multiple locks simultaneously while maintaining real-time communication with central management systems. Key Capabilities: Bi-directional communication with central systems Support for up to 24 locks per controller (expandable to 485 locks) Integration with infrared sensors for occupancy detection LED status indicators for visual feedback Operating temperature range of -25°C to +65°C Standby power consumption of just 60mA 3. Power Management Solutions KERONG recognizes that reliable power supply is crucial for smart locker operations. Their solutions include: Battery-Powered Systems Low-consumption locks (0.75W-1.2W unlocking power) combined with efficient controllers (0.25W standby power) enable extended battery life, making them ideal for installations where wiring is impractical. Solar-Powered Solutions For outdoor applications, KERONG offers solar-powered systems that combine low-energy components with solar panels and rechargeable batteries, ensuring continuous operation in remote locations. Central Power Supply Systems Indoor installations benefit from centralized power distribution, providing consistent power to all components while reducing maintenance requirements. 4. Communication and Networking Modern smart lockers require robust communication capabilities to integrate with existing infrastructure and management systems. KERONG's solutions support: TCP/IP Protocol Enables direct network connection for real-time monitoring and control from any authorized device with internet access. RS485 Communication Provides reliable multi-drop networking for large-scale installations, supporting up to 485 devices on a single network. Bluetooth Low Energy (BLE) Allows smartphone integration for user-friendly mobile applications and contactless operation. Applications Across Industries KERONG's smart locker components have found applications in diverse sectors: Logistics and Parcel Delivery Weatherproof locks with barcode scanner integration enable secure package delivery and retrieval systems for residential complexes, offices, and retail locations. Corporate Environments Centralized control systems with RFID authentication provide secure storage solutions for employees while enabling administrative oversight and usage tracking. Educational Institutions Robust construction combined with multiple authentication methods ensures student belongings remain secure while providing easy access for authorized users. Fitness and Recreation Waterproof electronic locks with temporary code capabilities are ideal for gym lockers, swimming pool facilities, and spa environments. Healthcare Facilities Hygienic, touchless operation through RFID or mobile app integration supports infection control protocols while maintaining security standards. Conclusion Whether you're implementing a small office locker system or deploying a large-scale parcel delivery network, understanding the core components and their capabilities is essential for making informed decisions. With companies like KERONG leading the way in smart locker technology, organizations can confidently invest in solutions that provide secure, efficient, and future-ready storage systems. For more information about KERONG's smart locker components and solutions, visit our website or contact our team of experts who can help design a customized solution for your specific requirements.

Mini locks, as small, exquisite, and portable locks, are highly favored for their unique digital password lock design. Not only are they compact, easy to hide and carry, but their digital password locks also provide users with a secure and flexible experience. China Kerong is a professional manufacturer of electronic smart locks, including digital password mini locks. We are a global source supplier of digital password mini locks. The digital password lock design of mini locks eliminates the inconvenience and easy loss of traditional keys. Users only need to remember a simple password of numbers to easily open or lock the lock. This design not only greatly improves ease of use but also enhances security. Because the digital password can be set by the user and changed at any time, it effectively prevents the risk of password leakage and unauthorized opening. mini lock digital password Furthermore, the digital password lock of mini locks is highly flexible. Users can set different lengths of passwords according to their needs, and can even combine letters, symbols, and other elements to create unique password passwords. This flexibility allows mini locks to adapt to various usage scenarios, whether it's a suitcase, backpack, drawer, or cabinet door. It's worth mentioning that the digital password lock design of the mini lock also takes user habits into account. Its button layout is logical and comfortable to use, preventing fatigue even after prolonged use. Furthermore, some high-end mini locks are equipped with LED displays or sound prompts, making operation more intuitive and convenient. In summary, the digital password lock design of the mini lock has won the favor of many users due to its convenience, security, and flexibility. It not only meets people's security needs but also reflects an extreme pursuit of user experience in its details. Whether for business trips, travel, or daily life, the mini lock can be a reliable security partner. Kerong welcomes companies with needs to use our digital password mini locks . We support wholesale, OEM, and ODM orders. Please leave us a message and discuss further.

China Kerong – A leading supplier of intelligent locker systems. With continuous technological advancements and increasing demands for convenient living, the development prospects of intelligent locker systems are vast. intelligent locker systems In the future, intelligent locker systems will evolve towards greater intelligence and personalization. For example, through artificial intelligence technology, the system can provide users with more personalized storage suggestions and services based on their usage habits and historical records. Simultaneously, the design of intelligent lockers will become more diverse, meeting the aesthetic needs of different locations and users. Furthermore, intelligent locker systems will be deeply integrated with other industries. For instance, collaborating with e-commerce platforms to achieve integrated delivery and storage services. After purchasing goods on an e-commerce platform, users can choose to store them in nearby intelligent lockers for convenient retrieval. This model not only improves logistics efficiency but also provides users with a more convenient shopping experience. As an innovative storage solution, intelligent locker systems , with their advanced technology, wide range of application scenarios, and significant advantages, are gradually changing the way people store their belongings. It is believed that in the near future, intelligent locker systems will be applied in more fields, bringing more convenience and surprises to people's lives. As a source supplier of intelligent locker systems, Kerong continuously innovates in the field of energy storage locker systems and welcomes outstanding companies to cooperate with us.

With the rapid development of e-commerce, the logistics industry is facing unprecedented challenges and opportunities. Against this backdrop, smart parcel locker systems have emerged as an effective solution to the "last mile" delivery problem. These systems not only improve logistics efficiency but also provide consumers with a more convenient and secure parcel pickup experience. China Kerong is a leading supplier of smart parcel locker systems , having already provided these systems to numerous countries worldwide. Kerong Smart Parcel Locker Systems Supplier A smart parcel locker system is a self-service parcel storage and retrieval device based on Internet of Things (IoT) technology. By integrating advanced identification, communication, and control technologies, it achieves automatic parcel storage, management, and retrieval. Users can easily store and retrieve their parcels in designated smart lockers using a mobile app or SMS verification code, eliminating the need for face-to-face interaction with couriers and significantly saving time and effort. The system's advantages lie in its high flexibility and convenience. On one hand, smart parcel lockers can operate 24/7 to meet users' needs for immediate parcel pickup; on the other hand, they can be flexibly deployed according to actual needs, easily integrating into communities, schools, office buildings, and commercial areas to provide users with convenient parcel pickup services. Furthermore, the smart parcel locker system boasts robust security features. Utilizing advanced encryption technology and authentication mechanisms, it ensures the security of user information and the integrity of parcels. Simultaneously, the system is equipped with real-time monitoring and alarm functions; in the event of any anomalies, it immediately notifies management for handling, effectively preventing the risk of parcel loss or theft. For logistics companies, the application of the smart parcel locker system also brings significant economic benefits. It reduces labor costs, improves delivery efficiency, and enables companies to better cope with peak-season delivery pressures. At the same time, by providing high-quality pickup services, it enhances user trust and loyalty, laying a solid foundation for the company's long-term development. Kerong believes that the smart parcel locker system will play an important role in more fields, bringing more convenience and surprises to people's lives. We welcome outstanding companies worldwide to use our Kerong smart parcel locker system.