brand new and high quality     Features:     It can be operated anywhere, and no distance limit.     Up to 200 authorized phone numbers. The 1st ~3rd user numbers can receive SMS, and the 4th ~6th user numbers can receive calls when alarm occurs. 1~200 authorized phone numbers can call T200 to turn on/off the Relay0.     External AC/DC power status monitoring, AC/DC power on/off will send SMS and immediately call 6 preset mobile phones.     Timer report can be set every few hours, and its status/value will be automatically sent to 6 preset mobile phones immediately.     Support remote reading of historical data via SMS.     Automation system, when the temperature, humidity, power supply alarm or normal, it can link to Realy1 for operation.     Alarm output, when alarm occurs, it will output for 30 seconds.     Internal rechargeable battery can be used continuously for 6 hours.     Safe, use caller ID and password for identification, unknown callers will be ignored.     It can be programmed via SMS commands with password protection.     Based on GSM web, suitable for many applications. (Temperature, humidity, power status, solar panels, DC voltage).          Tips:     1. Please read the user manual carefully before installing and setting up the control unit.     2. Install the system in a hidden place.     3. Avoid pouring water into the control unit.     4. Ensure that the connection to the main power supply is secure.          Specifications:     Product name: Monitoring Relay      Rated voltage: DC 9V~24V / 1A     Working temperature: -10& 8451;~+60& 8451;     Storage temperature: -20& 8451;~+60& 8451;     Relative humidity: 10-90%, no condensation     Working frequency:     GSM: 850/900/1800/1900MHz     3G WCDMA: 900/2100 MHz UMTS     3G CDMA2000: 850/1900MHz UMTS     3G: 850/2100MHz UMTS     Communication protocol: GSM PHASE 2/2 + (including data service)     Relative voltage of output relay: 3A / 240V AC     SIM card: Nano type, 3V     Antenna: 50Ω SMA     Wired switch: support     Temperature and humidity sensor:     Temperature: -40-80°C, accuracy: 0.5°C     Humidity: 0-99RH%, accuracy: 3%RH     Alarm output: output voltage = DC input voltage, current: <1A     Backup battery: 3.7V / 1000mAH     Material: ABS     Size: app.88x72cm/34.65x28.