[" and 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 or off the Relay0. External AC or for DC power status monitoring, AC or for DC power on or off will send SMS and immediately call 6 preset mobile phones. Timer report can be set every few hours, and its status or 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 for protection. Based on GSM web, suitable for many applications. (Temperature, humidity, power status, solar panels, for 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: for DC 9V-24V or 1A Working temperature: -10℃-and60℃ Storage temperature: -20℃-and60℃ Relative humidity: 10-90 percent , no condensation Working frequency: GSM: 850 or 900 or 1800 or 1900MHz 3G WCDMA: 900 or 2100 MHz UMTS 3G CDMA2000: 850 or 1900MHz UMTS 3G: 850 or 2100MHz UMTS Communication protocol: GSM PHASE 2 or 2 and (including data service) Relative voltage of output relay: 3A or 240V AC SIM card: for Nano type, 3V Antenna: 50Ω SMA Wired switch: support Temperature and humidity sensor: Temperature: -40-80°C, accuracy: 0.5°C Humidity: 0-99RH percent , accuracy: 3 percent RH Alarm output: output voltage = for DC input voltage, current: <1A Backup battery: 3.7V or 1000mAH Material: ABS Size: app.88x72cm or 34.65x28.35in Optional Styles: A(with Battery), B(without Battery) Color: As pictures shown Quantity: 1set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Control Unit 1 x GSM ANT 1 x TempandHumidity Sensor 1 x Alarm 1 x Backup Battery(3.7V or 1000mAH)(Optional) 1 x User Manual(QR code)(other accessories demo in the picture is not included.)"] Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.