Feature:1. Multi Functional Design: This relay switch features 4G network connectivity, APP WEB temperature and humidity linkage, and SMS power outage alarm functions, catering to a variety of needs.2. Aluminum Material: Made from aluminum material, this relay switch is durable and reliable, ensuring long lasting performance.3. Wide Range of Applications: This switch can be used as a relay switch for various occasions and devices. From home automation systems to industrial equipment control, this versatile switch can handle it all.4. Flexible and Convenient: Equipped with a standard SIM card and antenna interface, this switch offers easy operation, installation, and usage.5. Accurate Monitoring: With temperature and humidity sensor ports, this switch enables accurate and real time monitoring. Its wide detection range ensures precise measurements, providing critical information for environmental control and management.Specification:Item Type: 4G SMS Alarm ControllerProduct Model: SM4 WLTE EAMaterial: AluminumFunction: Relay SwitchPower Consumption: Standby 12V 50mA, Working Max 12V 200mA4G Frequency (LTE FDD): B1 B3 B5 B7 B8 B20GSM Frequency: 900 1800 MhzSIM Interface: Standard SIM CardAntenna Interface: Standard SMA InterfaceTemperature and Humidity Interface: 2 Sensor PortsTemperature Detection Range: -40 to 125℃Humidity Detection Range: 0 to FullOutput Logic: Normally Open and Normally ClosedWeight: Approx. 455.00g /16.05oz.Package List:1 x Remote Controller1 x Plug1 x User Manual3 x Accessories1 x Probe