Features: 1Multi Function Design: The controller is equipped with 4G network, APP WEB humidity and temperature linkage, and SMS power failure alert, meeting diverse needs. 2Wide Application: The 4G remote controller can be used as a relay switch with 4 channels, normally open and normally closed, suitable for various occasion and devices. 3Flexible and Convenient: The 4G remote switch controller is equipped with standard SIM card and antenna interface, simple operation, easy installation, and use. 4Accurate Monitoring: Equipped with 2 temperature and humidity sensor ports, the controller provides a wide detection range and real time accuracy. 5Aluminum Material: Made with durable and reliable aluminum material, the 4G 4 channel remote switch controller is sturdy, can be used for a long time. Specification: Item Type: 4G Remote Switch ControllerMaterial: AluminumWeight: Approx. 432g/15.2ozProduct Model: SM4 WLTE EAUsage: Relay SwitchPower Consumption: Standby 12V 50mA, Maximum 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 125CHumidity Detection Range: 0 to FullOutput Logic: Normally Open and Normally Closed Package List: 1 x 4G Remote Switch Controller1 x Plug1 x Instruction Manual3 x Accessories