Description: 1.TVOC Sensor:The indoor air quality monitor design with TVOC sensor to monitor CO2 value, temperature and humidity of air quality to keep your in health environment. 2.High-Precision:The sensor module with TVOC sensor to accurately monitor carbon dioxide, With intelligent color screen display and clear numbers. 3.Wide Application:Portable Co2 monitor with compact design suitable for monitoring the air quality at home, schools, office buildings, hospitals, restaurants, shopping malls, factories, hotels, laboratories etc. 4.Real-time Monitoring&Automatic Alarm:Carbon dioxide monitor can detect the air on real-time and when CO2 concentration 1999-above Four warning lights flashing at the same time to alarm. 5.Perfet Gift:Perfet gift for your valentines day gifts for him/her/ kids, with the air quality monitor, you can definitely know what is your environment be like and improve it according to the actual situation. 6.EASY TO OPERATE: long press the "on-off" key for 3 seconds on and off. The product does not need calibration, startup can be tested Specification: BATTERY POWER SUPPLY: built-in 1200mAh lithium battery, use TYPE-C charging cable to charge it. Smallterm size: 90 x 70 x 35mm Material:ABS Colour: Black,White (optional) Package Contents: 1 x Air Quality Analyzer 1 x USB Cable 1 x User Manual Only the above package content, other products are not included. Note: Light shooting 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.