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 ) . 2. Temperature Unit is optional (Centigrade or Fahrenheit ). 3. Check the History Record of temperature anytime. 4. Multi -User Supervision Supported : you can click to share the device to other users . 5. Buit in Buzzer : the Buzzer will sound when the detector was triggered. 6. APP :you can download it by searching for Tuya Smart or Smart Life, support android IOS smartphone. Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC100-240V Colour:As Shown Material:plastic Package Contents: 1 x Tuya WiFi Temperature Sensor Only the above package content, other products are not included. 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. 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. YJL official store