This detector is perfect to help you detect the HCHO or TVOC, making you know more about the surrounding air quality. Powered by 2 x AA batterys(not included), easy to operate and use. Features:Perfect to help you detect the HCHO or TVOC, making you know more about the surrounding air quality.Built-in 360 degree detector ports, high accuracy and high sensitivity.The LCD screen with blue color backlight indicates the value clearly.With three color indicator lights(green or yellow or red), different color light for different level alarm.Lightweight and portable, easy to carry. Suitable for home, office, factory, car or outdoor use.Powered by 2 x AA batterys(not included).One-key operation, easy to use. Specifications:Color: WhiteDisplay: LCD Screen with BacklightMeasurement Range: 0-3.888mg or mResolution: 0.001mg or or mDetecting Temperature: -10-45Storage Temperature: -20-50Working Voltage: 2.4-3.2VSensor Type: SemiconductorPowered by: 2 x AA Batterys (Not Included)Item Size: 190 x 24.5mm or 7.48 x 0.96inPackage Size: 225 x 85 x 40mm or 8.86 x 3.35 x 1.57inPackage Weight: 200g or 7.05ounce Package List:1 x Detector