Feature:1. SUPPORT A VARIETY OF NETWORKS: The alarm host adopt GSM, 3G, 4G network communication, which is not limited by distance, can be used anywhere2. 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 probe3. 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 network4. 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 SMS5. 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 reminderSpecification:Item Type: Environmental Monitoring AlarmMaterial: MetalWorking Voltage: Standard power supply 12VDC, supporting 9~36VDCPower Consumption: Standby: 20mA at 12V; Maximum Power Consumption: 150mA at 12VGSM, 3G, 4G: GSM Frequency: 850, 900, 1800, 1900 MHz (default)3G Network Format: 3G WCDMA (optional)4G LTE Band: 4G LTE (optional)SIM Card Interface: Support 3V SIM cardExternal Antenna: SMA antenna interface, 50 Supported Protocols: RTU Over TCP protocol, TCP protocolTemperature and Humidity Input: Host: -40~+80 , RH: 0-100 percentAM2301 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: 4~20mAPhase Power Input: Phase Voltage: 100~500VACBuilt in Battery: 1 x 3.7V 900mAh lithium battery(built in), lasting for 8 hoursWorking 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.Package List:1 x Alarm1 x Sensor1 x Antenna1 x Power Adapter1 x User Manual