This is a kind of quality air quality detector, which uses infrared semiconductor sensors, with high accuracy, stable working performance. Large color digital display, you can see the real time carbon dioxide concentration, time, temperature and humidity data clearly. Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, etc.. You can have a try. Features: Uses infrared semiconductor sensors, with high accuracy, stable performance, can accurately detect carbon dioxide value. Adopts air convection design, which can provides more accurate detection results, and the detection-range is from 400ppm to 5000ppm. Large color digital display, you can see the real time carbon dioxide concentration, time, temperature and humidity data clearly. 4-color circle design, different colors corresponding to different air quality, suitable for office, family, and other occasions. 0-799ppm the green color will flash, 800-1199ppm the yellow color will flash, 1200-1599ppm the orange color will flash, 1600-1999ppm the red color will flash, above 1999ppm 4 colors will flash. Strong anti-interference ability, low consumption and long service life. The product does not need calibration, it can be tested after booting, and it can accurately detect carbon dioxide. Hundreds of ventilation holes reserved on the housing not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a fine heat dissipation effect. Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, etc.. Specifications: Name: Air Quality Detector Model: X23 Material: ABS Color: black, white (optional) Battery: 1 * 18650 battery, 3.7V, 1200mAh (included) Display: LED digital display+LCD screen+backlight Detection ranges: 400-5000ppm Voltage: DC5V Recharging interface: Type-C Operation temperature: 1℃ to 70℃ Item size: 80 * 142 * 36mm / 3.15 * 5.59 * 1.42in Item weight: 120g / 4.23ounce Package size: 143 * 86 * 45mm / 5.63 * 3.39 * 1.77in Package weight: 160g / 5.64ounce Packing List: 1 * Air Quality Detector 1 * User Manual