Features Portable: This air quality tester is small in size and light in weight, which makes it very easy to carry around and use it at home or take it out for use. 5 In 1: This 5in1 detector can detect CO, CO2, AQI, HCHO and TVOC in real time, keeping us in a good air environment and away from the hazards of CO and CO2 gas poisoning. Rechargeable: This air quality testing tool is rechargeable, making this air quality tester portable to use on the go and without worrying about running out of power. Easy To Use: This tester is very easy to use, wherever you want to test the air quality, just turn the tester on and put it in that place, then wait for the result. Wide Application: This tester can be widely used in home indoor air quality testing, automobile air testing, mother and baby room air testing, public places testing. Specification: Item Type: Air Quality Tester Material: ABS Battery: Polymer Battery x 1, Battery Capacity: 850mAh ( Shipped With Built In Battery ) Power On Warm Up: 120s Working Time: About 180-240 Minutes Charging Time: About 3 Hours HCHO Range: 0-1.999 TVOC Range: 0-12 CO2 Range: 0-5000 AQI Index: 01-06 Package List: 1 x Air Detector  1 x USB Cable  1 x Manual  Package List 1 x Air Detector 1 x USB Cable 1 x Manual