Feature: 1. Multi Function Design: The controller is equipped with 4G network, APP WEB humidity and temperature linkage, and SMS power failure alert, meeting diverse needs. 2. Wide 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. 3. Flexible and Convenient: The 4G remote switch controller is equipped with standard SIM card and antenna interface, simple operation, easy installation, and use. 4. Accurate Monitoring: Equipped with 2 temperature and humidity sensor ports, the controller provides a wide detection range and real time accuracy. 5. Aluminum 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 Controller Material: Aluminum Weight: Approx. 432g/15.2oz Product Model: SM4 WLTE EA Usage: Relay Switch Power Consumption: Standby 12V 50mA, Maximum 12V 200mA 4G Frequency (LTE FDD): B1 B3 B5 B7 B8 B20 GSM Frequency: 900/1800Mhz SIM Interface: Standard SIM Card Antenna Interface: Standard SMA Interface Temperature and Humidity Interface: 2 Sensor Ports Temperature Detection Range: -40 to 125°C Humidity Detection Range: 0 to Full Output Logic: Normally Open and Normally Closed. Package List: 1 x 4G Remote Switch Controller 1 x Plug 1 x Instruction Manual 3 x Accessories