Product Description for 4G GSM Remote Control Box and Door Access Controller Enhance your home or business security with the cutting-edge GSM-KEY-4G Remote Control Box and Door Access Controller. Designed to provide unmatched convenience and security, this innovative system allows you to control access to your premises effortlessly from anywhere in the world. Discover the remarkable features that make this product a must-have for modern security solutions: Advanced Cellular Network Security The GSM-KEY-4G system leverages the power of cellular networks to provide a robust security solution. By utilizing caller ID recognition, the system automatically identifies authorized numbers and grants access, ensuring that only pre-approved individuals can enter. Global Connectivity with Industrial-Grade 4G Engine Equipped with a professional industrial-grade 4G engine, the GSM-KEY-4G functions like a standard 4G phone, using a SIM card to receive calls. The built-in 4G module ensures seamless operation across 4G, 3G, and GSM networks, enabling global access and control. Extensive User Capacity and Backup Power Support Capable of storing up to 200 authorized users, the GSM-KEY-4G checks incoming calls against a secure list, providing access only to recognized numbers. The system also features a power failure alarm for added security, with support for a rechargeable battery (battery not included). Unmatched Remote Access Flexibility Unlike traditional remote controls, the GSM-KEY-4G offers unparalleled flexibility by allowing you to manage access from afareven from another city. This feature ensures you can conveniently open doors without delay, enhancing accessibility and convenience. Dual Independent Relay Switches The system includes two independent relay switches, with the NO.1 relay activated by dialing its mobile number. This feature allows the connected device to turn on without incurring call charges, as the system identifies the authorized number, rejects the call, and activates the device seamlessly. Transform your security measures with the GSM-KEY-4G Remote Control Box and Door Access Controller. Its combination of advanced technology, global connectivity, and user-friendly operation makes it an essential tool for efficient and secure premises management. Experience the future of access control today.