1、SUPPORT A VARIETY OF NETWORKS: The alarm host adopt GSM, 3G, 4G network communication, which is not limited by distance, can be used anywhere 2、MONITORING VOLTAGE: Alarm and host built in microprocessor to monitor the power supply voltage value, measuring range 0~36V, no need to buy professional monitoring voltage probe 3、MULTIPLE FUNCTIONS: AM2301 digital temperature and humidity module is a temperature and humidity composite sensor with calibrated digital signal output. Supports RTU Over TCP and TCP protocols and can be connected to the cloud platform for real time monitoring through the network 4、REMOTE MONITORING: The power failure alarm can be set a fixed point every day or periodically automatically report the current state to the first user number, and the alarm history can be queried remotely through SMS 5、EXTENSIVE ALARM: Power off alarm supports 10 authorized user numbers, alarm can receive alarm SMS, the last 5 authorized numbers can also receive alarm phone reminder 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 1 x Alarm 1 x Sensor 1 x Antenna 1 x Power Adapter 1 x User Manual