The SM200 is a user-friendly and reliable GSM 4G remote switch controller, optimized with additional features for diverse scenarios. Users can remotely open doors without incurring phone charges by calling or sending a text message, with support for up to 200 authorized users. The device allows remote control through an app, toll-free phone calls, and SMS, providing versatile operation options. It includes authorization operation protection, ensuring only the main user can set authorized user access and operation times. The wide voltage power supply (DC9V-24V) features anti-reverse protection, enhancing safety and reliability. The SM200 remote switch controller enables seamless control of devices from anywhere using a mobile phone. With the ability to set up to 200 users, it allows for secure access management. The relay output can be controlled based on authorized calls, with customizable closing times ranging from 0 to 999 seconds. Additionally, users receive SMS notifications regarding device status, ensuring they are always informed. The device is designed for easy installation and operation, making it suitable for various applications. Color: Black Material: Metal Package Contents: 1*Gate Opener Single Relay Switch