Product Description for GSM-KEY-4G Remote Control Box and Door Access Controller Revolutionize your security setup with the GSM-KEY-4G Remote Control Box, an advanced cellular network-based door access controller that ensures seamless and secure entry management for your home or business. Explore the sophisticated features that make this system indispensable for modern security: Cellular Network-Based Security The GSM-KEY-4G system operates via a cellular network, utilizing caller ID to authenticate authorized users. When an approved number calls, the system recognizes the caller and automatically opens the door, providing efficient and secure access. Global Connectivity and Professional-Grade Technology Featuring an industrial-grade 4G engine, the GSM-KEY-4G functions like a regular 4G phone with its SIM card number, facilitating global connectivity. The built-in 4G module ensures compatibility with 4G, 3G, and GSM networks, enabling worldwide operation. Extensive User Capacity and Reliability This system can store up to 200 authorized users in its memory, verifying incoming calls against the stored list to ensure secure access. It also includes a power failure alarm for rechargeable batteries (battery not included), maintaining security even during power disruptions. Unmatched Remote Access Flexibility Unlike conventional remote controls, the GSM-KEY-4G allows you to manage access from virtually anywhere, even from another city, using your mobile phone. This feature provides unmatched convenience, enabling you to open doors remotely without any delay. Dual Independent Relay Switches Equipped with two independent relay switches, the system activates the NO.1 relay switch through a simple phone call. It rejects the call after identifying the authorized number, turning on the connected device without incurring call charges. Enhance your security infrastructure with the GSM-KEY-4G Remote Control Box, offering a perfect synergy of advanced technology, global connectivity, and ease of use. Ideal for both residential and commercial applications, this system ensures efficient, secure, and convenient access control, making it an essential component of any modern security system.