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 Controller Product Model: SM4 WLTE EA Material: Aluminum Function: Relay Switch Power Consumption: Standby 12V 50mA, Working Max 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: 2 Sensor Ports Temperature Detection Range: -40 to 125℃ Humidity Detection Range: 0 to Full Output Logic: Normally Open and Normally Closed Weight: Approx. 455.00g /16.05oz. Package List: 1 x Remote Controller 1 x Plug 1 x User Manual 3 x Accessories 1 x Probe