1、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 2、ACCURACY AND DURABLE: 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 3、WIDE APPLICATION: Handheld air quality tester is suitable for detecting HCHO, total volatile organic compounds, and assessing air quality in various environments 4、FAST SAMPLING RATE: The air quality monitor has a sampling rate of 1 second, ensuring quick and efficient detection of air pollutants for you 5、CONVENIENT POWER SUPPLY: Handheld air quality monitor is powered by a built in 3.7V 400mAh lithium battery, with the option to charge anytime, anywhere using the included charging cable