Feature: 1. Aluminum: Temperature humidity alarm is made of durable aluminum material, ensuring long lasting and dependable performance. 2. Accurate Monitoring: Provides real time and accurate temperature and humidity detection through the built in sensor ports. 3. Convenient and Flexible: Features standard SIM card and antenna interface, making installation and usage quick and easy. 4. Multifunctional Design: With 4G network, APP WEB temperature and humidity linkage, and SMS power outage alarm functions, it caters to various needs and requirements. 5. Wide Range of Applications: Ideal for controlling relay switches and especially suitable for industrial control applications. Specification: Item Type: GSM Gate Opener Material: Aluminum Weight: Approx. 536g / 18.9oz Product Model: SM8 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: 900MHz 1800MHz SIM Interface: Standard SIM Card Antenna Interface: Standard SMA Interface Temperature and Humidity Interface: 1 Sensor Port Temperature Detection Range: -40-125℃ Humidity Detection Range: 0-100% Output Logic: Normally Open and Normally Closed. Package List: 1 x GSM Gate Opener 1 x Control Board 1 x Plug 1 x User Manual 3 x Accessories