LCD screen, different font colors show different air quality, green 400-799 ppm, yellow 800-1199 ppm, orange 1200-1599 ppm, red 1600-1999 ppm, above 2000 ppm four colors flash simultaneously. The product is compact in size and easy to carry. The ventilation holes on the back not only accelerate the convection between the air and the machine to achieve effective detection, but also provide a fine heat dissipation effect. The product does not need calibration, boot can be tested, accurate detection of carbon dioxide, used in greenhouse planting, agricultural production, production warehouse, laboratory, family, etc. 1200mAh capacity battery for long working time, Type-C charging interface, easy charging. CO2 measuring range: 400-5000 ppm Temperature measuring range: 0-50℃ Humidity measuring range: 0%-99%RH Sensor: semiconductor sensor Battery: 3.7V, 1200mAh color: White Material: ABS size: 70 x 90 x 35 mm Package Contents: 1 x Air Quality Analyzer 1 x USB cable 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.