Feature: 1. Convenient Operation: The user can dial the device number through the authorized number, and the device will automatically reject the call and immediately send the current status SMS message to the caller. 2. Multi Numbers Supporting: Support 10 authorized user numbers, alarm can be received alarm SMS, the last 5 authorized numbers can also receive alarm phone reminder. 3. Temperature Monitoring: You can set high and low temperature alarms. When the current temperature reaches the alarm threshold, the system sends a short message or a phone call to notify the user. 4. Cloud Platform Connecting: 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. Easy to Install: This GSM temperature monitoring alarm is made of stable and reliable metal material, which is durable, solid and can be used for a long time. Specification: 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 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 Size: Approx. 70 x 88 x 30cm / 27.6 x 34.6 x 11.8in(LxWxH) 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;. Package List: 1 x Temperature Alarm 1 x Antenna 1 x Sensor 1 x Power Adapter 1 x Manual