Feature:1. Advanced Features: This relay switch comes with a power loss function, 4G network remote control, temperature and humidity monitoring, and power outage alarm capabilities.2. Multi Channel Sensor Support: The device provides support for two temperature and humidity sensor ports, making it widely applicable in various environmental conditions.3. Flexibility in Usage: With four relay channels, the remote controller supports 10A or 15A output logic. This flexibility in functions ensures that the device can handle a variety of situations efficiently.4. Convenient Networking: From supporting standard SIM cards to having extensive coverage of 4G and GSM frequencies, this relay switch ensures convenient networking. Seamlessly controlled via a mobile APP or web, it offers user friendly operation.5. Aluminum Material: The GSM remote control relay switch is made from aluminum material ensuring its stability and durability. Its robust construction means it can stand up to constant use and last for a long time.Specification:Item Type: GSM Remote Control Relay SwitchMaterial: AluminumWeight: Approx. 433.00g / 15.27ozPower Consumption: Standby 12V 50mA, Maximum Work 12V 200mA4G Frequency (LTE FDD): B1 B3 B5 B7 B8 B20GSM Frequency: 900/1800MhzSIM Interface: Standard SIM CardAntenna Interface: Standard SMA InterfaceTemperature and Humidity Interface: 2 Sensor PortsTemperature Detection Range: -40 to 125Humidity Detection Range: 0 to FullOutput Logic: Normally Open and Normally Closed.Package List:1 x Remote Controller1 x Plug1 x Instruction Manual3 x Accessories