It is a quality air quality detector, using a superior electrochemical sensing module, with high accuracy, stable performance, capable of accurately detecting carbon dioxide value. Large screen design, you can see the measurement data clearly. Different colors display different air quality, 400-450ppm green, 451-700ppm blue, 701-1000ppm purple, 1001-2000ppm yellow, 2001-5000ppm red. You can try it. Features: The intelligent carbon dioxide value tester uses a semiconductor sensor to control air temperature and humidity for air quality. Adopts a superior electrochemical sensing module, with high accuracy and stable performance, capable of accurately detecting carbon dioxide. Strong anti-interference ability, low power consumption, and a long service life. The product does not require calibration; it can be tested after startup and can accurately detect carbon dioxide. Different colors correspond to different air quality: 400-450ppm green, 451-700ppm blue, 701-1000ppm purple, 1001-2000ppm yellow, and 2001-5000ppm red. Hundreds of ventilation holes on the back of the housing not only accelerate the convection between air and the machine, thus achieving efficient detection, but also provide a fine heat dissipation effect. Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, etc. There are 4 types for you to choose, you can choose 3in1 white, 3in1 black, 5in1 white, 5in1 black according to your demands. 3in1: The large screen displays power, CO2 value, temperature and humidity. 5in1: The large screens display power, CO2 value, TVOC value, HCHO value, temperature and humidity. Features: Name: Air Quality Detector Type: 5-IN-1 Black, 3-IN-1 Black, 5-IN-1 White, 3-IN-1 White (Optional) Battery: 1 * 3.7V, 1200mAh Lithium Battery (Included) Screen Type: 2.8 inch TFT-LCD Material: ABS Screen Resolution: 240 * 240 Response Time: 1s Test Temperature Range: -10?℃?to 70?℃ Test Humidity Range: 0-99% RH Working Voltage: 5V / 1A Adapter Maximum Power: 600mA Charging Current Charging: USB Size of Item: 71.2 * 91.6 * 36.5 / 2.80 * 3.61 * 1.44in Item Weight: 126g / 4.44oz Package Size: 119 * 119 * 40mm / 4.69 * 4.69 * 1.57in Package Weight: 163g / 5.75oz Packing List: 1 * Air Quality Detector 1 * Cable 1 * User Manual