1、Temperature Humidity Sensor: The digital temperature and humidity module is a temperature and humidity composite sensor with calibrated digital signal output and supports for RTU Over TCP and for TCP protocols. 2、Network Communication: The host adopts GSM, 3G, 4G network communication, which is not limited by distance and can be used anywhere. 3、Voltage Detection: The host has a built in microprocessor to monitor the voltage value of the power supply, so there is no need to purchase a professional monitoring voltage probe, saving costs. 4、Automatic Reporting: Users can set the daily fixed point or periodically automatically report the current status to the first user number, and can remotely query the alarm history via SMS. 5、Humanized Design: The alarm supports 10 authorized user numbers, which can receive alarm SMS when alarming, and the last 5 authorized numbers can also receive alarm call reminders. Item Type: Temperature Humidity Alarm Material: Metal Power Consumption : Standby: 20mA at 12V Maximum Power Consumption : 150mA at 12V GSM, 3G, 4G: GSM Frequency: 850, 900, 1800, 1900MHz (default) SIM Card Interface: Support 3V SIM card External Antenna: SMA antenna interface,50 Ohm Support Protocol: For RTU Over TCP protocol, for TCP protocol Temperature and Humidity Input: Host: -40-80℃ RH: 0-100% AM2301 Sensor: Temperature Measurement Range: -40℃-80℃ Accuracy: ±0.5℃ Humidity Measurement Range: 0-99.9%RH Accuracy: ±3%RH (sensor wire length 5m) Temperature Input: Temperature Measurement Range: -55℃-125℃, accuracy ±0.5℃ Analog Input: 4-20mA Phase Power Input: Built-in Battery: 1 x 3.7V/900mAh lithium battery (built in), can work for 8 hours Operating Temperature Range: -10℃-60℃ Operating Humidity Range: 95% relative humidity (no condensation) Device Size: Approx. 70 x 88 x 30mm / 2.76 x 3.46 x 1.18in 1 x Temperature Humidity Alarm 1 x Sensor 1 x Antenna 1 x Power Adapter 1 x Instruction