Experience unparalleled control and flexibility with our 7-Channel 4G Relay Switch, a versatile remote control solution designed to simplify and enhance your automation needs. This advanced relay module is perfect for various applications, offering robust features and effortless operation for users worldwide. Independent Relay Control: The switch features seven independent relay channels, allowing you to activate the NO.1 relay switch by simply dialing its cell phone number. With GSMRELAY4G connectivity, you can easily turn the switch on or off by sending an SMS. Cost-Effective Call Management: Designed to refuse calls without answering, the switch prevents unauthorized access and incurs no call charges. It identifies authorized phone numbers to maintain secure operations. Global 4G Connectivity: With support for 4G, 3G, and GSM networks, this relay switch offers worldwide functionality. Perform remote password operations and changes from anywhere, ensuring you stay connected and in control. Flexible Output Modes: Each relay output can operate in switch mode or pulse timing mode. The system supports both free control and security authorization number control modes, allowing you to program easily in minutes using a mobile phone or PC software. Customizable Features: Disable the SMS reply function to save costs. The switch supports equipment operation history log checks and custom commands, offering two output modes: relay output with call mode and relay output with SMS control. Robust Relay Specifications: Equipped with 7-channel 50V 30A 50 Hz relay