Usage Tips: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: AC100-240VColour:As ShownMaterial:plasticPackage Contents:1 x Tuya WiFi Temperature SensorOnly 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.