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 T200 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, humidity, 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, humidity, 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℃~&#43;60℃<br />Storage temperature: -20℃~&#43;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 &#43; (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 and humidity sensor:<br />Temperature: -40-80°C, accuracy: 0.5°C<br />Humidity: 0-99RH%, accuracy: 3%RH<br />Alarm output: output voltage &#61; DC input voltage, current: &lt;1A<br />Backup battery: 3.7V / 1000mAH (with Battery or without Battery optional)<br />Material: ABS<br />Item Size: Approx. 8.8 * 7.3 * 6cm / 3.5 * 2.9 * 2.4in<br/>Package Information:<br />Package Size: Approx. 17.5 * 9.3 * 7cm / 6.9 * 3.7 *  2.8cm<br />Package Weight: Approx. 340g / 12oz<br/>Note:<br />Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.<br />Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!<br /> <br />Package List:<br />1 * GSM Temperature Humidity Alarm Relay<br />1 * Temp &amp; Humidity Sensor<br />1 * Power Adapter (US/EU/UK/AU optional)<br />1 * User Manual(QR code). * 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.