Environmental Monitoring Alarm GMS 3G 4G LTE Temperature Humidity Power Off Sensor Set AC100‑240V 4GL‑A US Plug Item Type: Environmental Monitoring Alarm Material: Metal Power Consumption: Standby: 20mA at 12V; Maximum Power Consumption: 150mA at 12V GSM, 3G, 4G: GSM Frequency: 850, 900, 1800, 1900 MHz (default) SIM Card Interface: Support 3V SIM card External Antenna: SMA antenna interface, 50 Ω Supported Protocols: RTU Over TCP protocol, TCP protocol Temperature and Humidity Input: Host: -40~+80 ℃, RH: 0-100 percent AM2301 Sensor: Temperature Measurement Range: - 40 ℃~80 ℃, Accuracy: ± 0.5 ℃, Humidity Measurement Range: 0~99.9% RH, Accuracy: ± 3% RH (sensor line length 20meter) Temperature Input: Temperature Measurement Range: - 55 ℃~125 ℃, Accuracy: ± 0.5 ℃ Analog Input: 4~20mA Built in Battery: 1 x 3.7V 900mAh lithium battery(built in), lasting for 8 hours Working Temperature Range: - 10 ℃~60 ℃ Operating Humidity Range: Relative humidity 95% (no condensation) Equipment Size(LxWxH): Approx. 70 x 88 x 30mm / 2.76 x 3.46 x 1.18in