1. Built- in Rechargeable battery : can be powered by external DC5V power supply or standby battery ( Please note : if you want to power the detector via backup battery ,Please open the back cover and switch on the detector ) .<br> 2. Temperature Unit is optional (Centigrade or Fahrenheit ).<br> 3. Check the History Record of temperature anytime.<br> 5. Multi -User Supervision Supported : you can click to share the device to other users .<br> <br> 6. Buit in Buzzer : the Buzzer will sound when the detector was triggered.<br> 7. APP :you can download it by searching for Tuya Smart or Smart Life, support android IOS smartphone.<br> Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on.<br> Voltage: AC100-240V<br> Colour:As Shown<br> Material:plastic<br> <br> Package Contents:<br> 1 x Tuya WiFi Temperature Sensor<br> <br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.