Features:It can be operated from anywhere without distance restrictions.GSM temperature monitoring alarm can reject calls from authorized numbers without making a call.Multiple applications (temperature, power state, solar panel, DC voltage).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.A DS18B20 temperature sensor input with a temperature range of -55- + 125C and an accuracy of 0.5C.Monitor external AC power status, AC on/off will send SMS to authorized phone number.The built-in MCU has a measurement range of 9-36 VDC, eliminating the need for additional sensors and saving costs.Set it once every once in a while (the user can set the time by himself) and automatically send its status to the authorized number.Support remote reading of historical data via SMS.Supports TCP and RTU over TCP protocol for cloud monitoring.Rechargeable backup battery lasts for 8 hours.Use caller ID and password to identify and ignore unknown calls.Can be programmed via SMS protected SMS command or APP.Based on GSM network, it is suitable for many applications.Automatically restart the cycle by remote reset and restart via SMS.Specifications:Condition: Brand NewOptional Plug: EU Plug, US Plug, UK Plug, AU PlugColor: Shown as PictureMaterial: ABS PlasticWorking Voltage: standard power supply 12 VDC, support 9~36VDCPower Consumption: Standby: 12 V/20 mA; maximum power consumption: 12V/150mAGSM Frequency: 850/900/1800/1900MHzSIM Card Interface: support 3 VSIM cardExternal antenna: SMA antenna interface, 50 ohmsSupport Protocol: RTU Over TCP protocol, TCP protocolTemperature input: DS18B20Temperature Measurement range: -55 C ~ 125 C, accuracy 0.5 CBuilt-in Battery: 3.7V/900mAhWorking Temperature: -10 C ~ 60 COperating Humidity: Relative Humidity 95% (no condensation)Size: Approx. 70mm * 88mm * 30mm/2.8 * 3.5 * 1.2 inPackage List:1 * GSM Monitoring Alert1 * Antenna1 * Power Adapter1 * Instruction ManualNote:The function of measuring temperature needs to be used with the DS18B20 temperature sensor. This product accessory does not contain the DS18B20 temperature sensor and must be purchased by the customer.