7 In 1 Monitoring: This quality detector can detects the PM2.5, TVOC, CO2, HCHO, temperature, humidity and for you. Alarm threshold funciton, you can set the value by yourself and it will alarm you when the detected data over the value. Wide Application: You can use this product for home detect, car detect, office detect, hotel and so on. Built-in capacity lithium battery to supplys , so you can recharge it in time. History Viewing: You can press the "on/off" button to enter the history interface and view the history data. Specifications: Type: Tuya WiFi version PM2.5 Measuring ranges: 0-9999ug/m3 Resolution: 1ug/m3 TVOC Measuring ranges: 0~3mg/m3 Resolution: 0.001mg/m3 CO2 measuring ranges: 400-5000PPM HCHO measuring ranges: 0-3mg/m3 Resolution: 0.001mg/m3 Temperature measuring ranges: 0~60 Humidity measuring ranges: 0~99%RH Battery: 1 * lithium battery, 1200mAh (included) Material: ABS colour: White Package Contents: 1 x Quality Monitor 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.