Usage Tips:1. Temperature & Humidity Detection 2-in-1 . 2. 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) . 3. Temperature Unit is optional(Centigrade or Fahrenheit). 4. Check the History Record of temperature or humidity anytime. 5. Multi -User Supervision Supported : you can click to share the device to other users. Buit in Buzzer:the Buzzer sound when the detector was triggered. APP:you can download it by searching for Tuya Smart or Smart Life Powered by:DC5V 1A power adapter (included) Built-in rechargeable battery:3.7V 1100MA Note:the backup battery switch located at circuit board. For the first time use, please remember to open the back cover, then switch on backup battery switch. Battery standby time:about 6 hours Alarm Indication:The digital tube number flashes Pairing indication:Green indicator flashes Detecting temperature:-40 to +120 Detecting Humidity:0% to (no condensation) Temperature humidity accuracy:0.5 1%RH Measurement error:1 3%RH WIFI band:2.4G (not support 5G) Buzzer alarm time:default 15 seconds uncontrollable Size:90mm x 63mm x 25mm If the temperature (Humidity) is higher or lower than the range of temperature (humidity) we preset. The detector push the alarm alerts to app and at the same time the detector sound to remind to control the temperature (humidity). And you can do the real-time supervision via app. Colour:Black & White Material:ABS Package Contents: 1 * Smart Display 1 * DC5V1A Adapter 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.