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: White Display: LCD Screen with Backlight Measurement Range: 0~3.888mg/m Resolution: 0.001mg//m Detecting Temperature: -10~45 Storage Temperature: -20~50 Working Voltage: 2.4~3.2V Sensor Type: Semiconductor Powered by: 2 * AA Batterys (Not Included) Item Size: 190 * 24.5mm / 7.48 * 0.96in Package Size: 225 * 85 * 40mm / 8.86 * 3.35 * 1.57in Package Weight: 200g / 7.05ounce Package List: 1 * Detector