This detector is perfect to help you detect the HCHO/TVOC, making you know more about the surrounding air quality. Powered by 2 * AA batterys(not included), easy to operate and use. Features:Perfect to help you detect the HCHO/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/yellow/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 * AA batterys(not included).One-key operation, easy to use. Specifications:Color: WhiteDisplay: LCD Screen with BacklightMeasurement Range: 0~3.888mg/mResolution: 0.001mg//mDetecting Temperature: -10~45Storage Temperature: -20~50Working Voltage: 2.4~3.2VSensor Type: SemiconductorPowered by: 2 * AA Batterys (Not Included)Item Size: 190 * 24.5mm / 7.48 * 0.96inPackage Size: 225 * 85 * 40mm / 8.86 * 3.35 * 1.57inPackage Weight: 200g / 7.05ounce Package List:1 * Detector