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 WhiteMaterial plasticsize 90 x 35 x 70mmPackage Contents 1 x Air Quality Monitor1 x charging cable1 x English manualOnly 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.