Features PORTABLE DESIGN: Handheld air quality detector upgraded with a large screen display for clear and visible readings, multiple alarm modes to meet different usage needs, and accurate detection ACCURACY: Handheld air quality meter equipped with a high accuracy gas sensitive semiconductor sensor, ensuring accurate measurement results; Come with a rechargeable lithium battery for longer battery life WIDE APPLICATION: Handheld air quality tester is suitable for detecting HCHO, total volatile organic compounds, and assessing air quality in various environments FAST SAMPLING RATE: The air quality monitor has a sampling rate of 1 second, ensuring quick and efficient detection of air pollutants for you CONVENIENT POWER SUPPLY: Handheld air quality monitor is powered by a built in 3.7V 400mAh lithium battery, with the option to charges anytime, anywhere using the included charging cable Spec: Item Type: Handheld Air Quality Detector Material: ABS Sampling Rate: 1 Second Power Supply: Built in 3.7V lithium battery 400mAh How to Use: Turn on the machine and wait for the preheating to finish. After the beep sound, start to use. PackageList: 1 x Air Quality Tester 1 x User Manual 1 x USB Cable Package List 1 x Air Quality Tester 1 x User Manual 1 x USB Cable