Features:
1.GSM temperature monitoring alarm can reject calls from authorized numbers without making a call.Users can dial the device number by authorization number.
2.The device will automatically refuse to receive and immediately send short messages of the current status (temperature and voltage) to the caller.
3.Multiple applications (temperature, power state, solar panel, DC voltage).
4.Up to 10 authorized phone numbers, 5 can be used to answer calls or text messages, and 5 can be used for calls and text messages to generate alarms.
5.The built-in MCU has a measurement range of 0-36 VDC, eliminating the need for additional sensors and saving costs.Support remote reading of historical data via SMS.
6.Supports TCP and RTU over TCP protocol for cloud monitoring.
7.Use caller ID and password to identify and ignore unknown calls.
8.Can be programmed via SMS protected SMS command or APP.
9.Based on GSM network, it is suitable for many applications.
10.Automatically restart the cycle by remote reset and restart via SMS.

Specifications:
Working Voltage: standard power supply 12VDC, support 9~36VDC
Power Consumption: Standby: 12V/20mA; Maximum Power Consumption: 12V/150mA
GSM Frequency: 850/900/1800/1900MHz
SIM Card Interface: support 3V SIM Card
External Antenna: SMA Antenna Interface, 50 ohms
Support Protocol: RTU Over TCP protocol, TCP protocol
Built-in Battery: 3.7V/900mAh(Included)
Operating Humidity: Relative Humidity 95% (no condensation)
Size: Approx. 70mm * 88mm * 30mm/2.8 * 3.5 * 1.2 in

Package List:
1 * GSM Alert
1 * Antenna
1 * Power Adapter
1 * Instruction Manual