1、Temperature Setting: The high and low limit alarm values of temperature can be set according to the actual application. Once the current value reaches the alarm value, an alarm SMS will be sent and a phone call will be made to notify the user. 2、SMS Reminder: The environmental monitoring alarm supports 10 authorized user numbers, which can receive alarm SMS when alarming, among which the last 5 authorized numbers can also receive alarm telephone reminder. 3、Current Status Inquiry: Users can call the device number through the authorized number, the device will automatically reject and immediately send the current status SMS to the caller, users can also query the current status through SMS command. 4、Periodic Reminder: Temperature humidity alarm can be set to automatically report the current status to the first user number at a fixed point every day or periodically, with smart chip, dependable to use. 5、Real Time Monitoring: Support for Modbus RTU Over TCP and for Modbus TCP protocol, can connect to cloud platform for real time monitoring through network. The built in rechargeable battery can continue to work for 8 hours in case of power failure. Item Type: Temperature 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 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℃-125℃ (1m): Temperature measurement range -55℃-125℃, accuracy ±0.5℃ Built in Battery: 3.7V/900mAh lithium batteryx1 (built in), can work for 8 hours Operating Temperature Range: -10℃-60℃ Operating Humidity Range: Relative humidity 95% (noncondensing) 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 Alarm 1 x Antenna 1 x Sensor 1 x Power Adapter 1 x Instruction