["Features:\nIt can be operated anywhere, and no distance limit.\nUp 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.\nExternal AC/for DC power status monitoring, AC/for DC power on/off will send SMS and immediately call 6 preset mobile phones.\nTimer report can be set every few hours, and its status/value will be automatically sent to 6 preset mobile phones immediately.\nSupport remote reading of historical data via SMS.\nAutomation system, when the temperature, power supply alarm or normal, it can link to Realy1 for operation.\nAlarm output, when alarm occurs, it will output for 30 seconds.\nInternal rechargeable battery can be used continuously for 6 hours.\nSafe, use caller ID and password for identification, unknown callers will be ignored.\nIt can be programmed via SMS commands with password for protection.\nBased on GSM web, suitable for many applications. (Temperature, power status, solar panels, for DC voltage).\n\nTips:\n1. Please read the user manual carefully before installing and setting up the control unit.\n2. Install the system in a hidden place.\n3. Avoid pouring water into the control unit.\n4. Ensure that the connection to the main power supply is secure.\n\nSpecifications:\nProduct name: Monitoring Relay \nRated voltage: for DC 9V~24V / 1A\nWorking temperature: -10℃~+60℃\nStorage temperature: -20℃~+60℃\nRelative humidity: 10-90%, no condensation\nWorking frequency:\nGSM: 850/900/1800/1900MHz\n3G WCDMA: 900/2100 MHz UMTS\n3G CDMA2000: 850/1900MHz UMTS\n3G: 850/2100MHz UMTS\nCommunication protocol: GSM PHASE 2/2 + (including data service)\nRelative voltage of output relay: 3A / 240V AC\nSIM card: for Nano type, 3V\nAntenna: 50Ω SMA\nWired switch: support\nTemperature sensor:\nTemperature: -55~+125°C, accuracy: 0.1°C\nAlarm output: output voltage = for DC input voltage, current: <1A\nBackup battery: 3.7V / 1000mAH\nMaterial: ABS\nSize: app.88x77mm/3.46x3.03in\nOptional Styles: A(with Battery), B(without Battery)\nColor: As pictures shown\nQuantity: 1 Set\n\nPackage includes:\n1 x Control Unit\n1 x GSM ANT\n1 x Temperature Sensor\n1 x Alarm\n1 x Backup Battery(3.7V/1000mAH)(Optional)\n1 x User Manual(other accessories demo in the picture is not included.)"]