1. LCD screen, different font colors showing different air quality, green 400-799ppm, yellow 800-1199ppm, orange 1200-1599ppm, red 1600-1999ppm, 2000ppm over four colors flash at the same time. 2. The product is in size and easy to transport. The ventilation holes at the rear not only accelerate the convection between the air and the machine, to achieve effective detection, also a fine heat dissipation effect. 3. The product does not need calibration, the can test, the accurate detection of carbon dioxide, used in greenhouse crop agricultural production, production warehouse, laboratory, family and so on. 4. The CO2 analyzer uses a semiconductor TVOC sensor to calculate the concentration of carbon dioxide, with stable performance, low consumption and long service life. 5. 1200mAh capacity battery for long working time, Type-C charging interface, easy charging. colour:Black Material:plastic size:90 x 35 x 70mm Package Contents: 1 x Air Quality Monitor 1 x charging cable 1 x English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.