7 In 1 Monitoring: This air quality detector can detects the PM2.5, TVOC, CO2, HCHO, temperature, humidity and . Alarm 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 air detect, car air detect, office air detect, hotel and so on. Built-in capacity lithium battery to supplys power, so you can recharge it in time. History Viewing: You can press the "on/off" button to enter the history interface and the history data. Specifications: Type: No WiFi version PM2.5 Measuring ranges: 0-9999ug/ Resolution: 1ug/ TVOC Measuring ranges: 0~3mg/ Resolution: 0.001mg/ CO2 measuring ranges: 400-5000PPM HCHO measuring ranges: 0-3mg/ Resolution: 0.001mg/ Temperature measuring ranges: 0~60 Humidity measuring ranges: 0~99%RH Battery: 1 * lithium battery, 1200mAh (included) : ABS colour: black Package Contents: 1 x Air 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.