Feature: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.Specification:Item Type: Temperature Humidity AlarmMaterial: MetalOperating Voltage: Standard power supply 12VDC, support 9~36VDCPower Consumption :Standby: 20mA at 12VMaximum Power Consumption : 150mA at 12VGSM, 3G, 4G:GSM Frequency: 850, 900, 1800, 1900MHz (default)3G Network Band: 3G WCDMA (optional)4G LTE Band: 4G LTE (optional)SIM Card Interface: Support 3V SIM cardExternal Antenna: SMA antenna interface,50 OhmSupport Protocol: For RTU Over TCP protocol, for TCP protocolTemperature and Humidity Input:Host: -40-80RH: 0-100%AM2301 Sensor:Temperature Measurement Range: -40-80Accuracy: 0.5Humidity Measurement Range: 0-99.9%RHAccuracy: 3%RH (sensor wire length 5m)Temperature Input: Temperature Measurement Range: -55-125, accuracy 0.5Analog Input: 4-20mA Phase Power Input: Phase Voltage: 100-500VACBuilt-in Battery: 1 x 3.7V/900mAh lithium battery (built in), can work for 8 hoursOperating Temperature Range: -10-60Operating Humidity Range: 95% relative humidity (no condensation)Device Size: Approx. 70 x 88 x 30mm / 2.76 x 3.46 x 1.18in.Package List:1 x Temperature Humidity Alarm1 x Sensor1 x Antenna1 x Power Adapter1 x Instruction