1、Temperature Monitoring: You can set the high and low alarm values of the temperature, and once the current value reaches the alarm value, an alarm SMS and a call will be sent to notify the user. 2、Dialing Status Query: The user can dial the device number through the authorized number, and the device will automatically reject the device and immediately send the current status SMS to the caller. 3、SMS Status Query: Users can also query the current status through SMS commands, and the device can set a fixed point every day and periodically report the current status SMS to the first user. 4、Supported Protocols: Support for Modbus RTU Over TCP and for Modbus TCP protocol to connect to the cloud platform, and monitor the current status in real time through the network. 5、Authorized Number: Support 10 authorized user numbers, can receive alarm SMS when alarming, and the last 5 authorized numbers can also receive alarm call reminders. Item Type: Temperature Alarm Material: Metal Working Voltage: Standard power supply 12VDC, support 0~36VDC Power Consumption: Standby: 20mA at 12V; Maximum power consumption: 150mA at 12V GSM/3G/4G: GSM Frequency: 850/900/1800/1900MHz (default) SIM Interface Supports 3V SIM cards External Antenna: SMA antenna interface, 50 ohms Support Protocol: for Modbus RTU Over TCP protocol, for Modbus TCP protocol Temperature Input: Host: -55°C~125°C (20m): Temperature measurement range -55°C~125°C, accuracy ±0.5°C Built in Battery: 3.7V/900mAh lithium batteryx1 (built in), can work for 8 hours Operating Temperature Range: -10°C~60°C Operating Humidity Range: Relative humidity 95% (non-condensing) Device Dimensions: Length 70mm/2.76in Width: 88mm/3.46in  Height: 30mm/1.18in Typical Application Sites: Base station transceiving, for ATM monitoring, power station monitoring, pump station monitoring and other remote data acquisition and monitoring fields; Unattended computer room monitoring, power room monitoring, machine room dynamic environment monitoring; Remote data collection and monitoring of solar power stations and intelligent charging piles; Water level, water pressure, flow, flow rate and other parameters collection; Wind speed, wind power, rainfall, temperature and other parameters of the meteorological observatory collection; Data collection of oil level, oil temperature, oil pressure, etc.; Intelligent agricultural temperature and humidity data collection and monitoring; Intelligent breeding temperature and humidity data collection and monitoring; Data collection and monitoring of temperature and humidity in warehousing and libraries; Data collection and monitoring of meteorological station information; Temperature monitoring of cold storage, fruit and vegetable storage room, industrial computer room, substation cabinet, etc.; Other occasions where temperature and humidity, PM2.5 value, and carbon dioxide distribution need to be monitored; 1 x Temperature Alarm 1 x Antenna 1 x Sensor 1 x Power Adapter 1 x Instruction Manual