Feature: 1. Multifunctional Design: Equipped with 4G network, APP WEB temperature and humidity linkage, and SMS power outage alarm functions to meet different needs. 2. Widely Used: SM2 WLTE EA 2 chanel 4G romote controller can be used as a relay switch, suitable for various scenes and equipment. 3. Flexible and Convenient: Standard SIM card and antenna interface, easy to operate, easy to install and use, good using experience. 4. Accurate Monitoring: Equipped with temperature and humidity sensor ports, with a wide detection range and real time accuracy. 5. Aluminum Material: 4G GSM dual channel remote switch controller is made of aluminum material, durable, reliable, and long lasting. Specification: Item Type: 2 Channel Remote Control Relay Switch Product Material: Aluminum Weight: Approx. 298g / 10.5oz Usage: Relay Switch Power Consumption: Standby 12V 50mA, Maximum 12V 200mA 4G Frequency (LTE FDD): B1/B3/B5/B7/B8/B20 GSM Frequency: 900/1800 MHz SIM Interface: Standard SIM Card Antenna Interface: Standard SMA Interface Temperature and Humidity Interface: 1 Sensor Port Temperature Detection Range: -40 to 125℃ Humidity Detection Range: 0 to 100% Output Logic: Normally Open and Normally Closed. Package List: 1 x Remote Controller 1 x Plug 1 x User Manual 2 x Accessories