Features:<br> * It can be operated anywhere, and no distance limit.<br> * 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 T201 to turn on/off the Relay0.<br> * External AC/DC power status monitoring, AC/DC power on/off will send SMS and immediately call 6 preset mobile phones.<br> * Timer report can be set every few hours, and its status/value will be automatically sent to 6 preset mobile phones immediately.<br> * Support remote reading of historical data via SMS.<br> * Automation system, when the temperature, power supply alarm or normal, it can link to Realy1 for operation.<br> * Alarm output, when alarm occurs, it will output for 30 seconds.<br> * Internal rechargeable battery can be used continuously for 6 hours.<br> * Safe, use caller ID and password for identification, unknown callers will be ignored.<br> * It can be programmed via SMS commands with password protection.<br> * Based on GSM web, suitable for many applications. (Temperature, power status, solar panels, DC voltage).<br> <br> Tips:<br> 1. Please read the user manual carefully before installing and setting up the control unit.<br> 2. Install the system in a hidden place.<br> 3. Avoid pouring water into the control unit.<br> 4. Ensure that the connection to the main power supply is secure.<br> <br> Specifications:<br> Product name: Monitoring Relay<br> Rated voltage: DC 9V~24V / 1A<br> Working temperature: -10℃~+60℃<br> Storage temperature: -20℃~+60℃<br> Relative humidity: 10-90%, no condensation<br> Working frequency:<br> GSM: 850/900/1800/1900MHz<br> 3G WCDMA: 900/2100 MHz UMTS<br> 3G CDMA2000: 850/1900MHz UMTS<br> 3G: 850/2100MHz UMTS<br> Communication protocol: GSM PHASE 2/2 + (including data service)<br> Relative voltage of output relay: 3A / 240V AC<br> SIM card: Nano type, 3V<br> Antenna: 50Ω SMA<br> Wired switch: support<br> Temperature sensor:<br> Temperature: -55℃~+125℃:0.1℃<br> Alarm output: output voltage = DC input voltage, current: