Usage Tips:LCD screen, different font colors display different air quality, green 400-799ppm, yellow 800-1199ppm, orange 1200-1599ppm, red 1600-1999ppm, 2000ppm above four colors flash at the same time.The product is compact in size and easy to carry. The ventilation holes in the rear not only accelerate the convection between the air and the machine, so as to achieve effective detection, but also provides fine heat dissipation effect.The product does not need calibration, startup can be tested, accurate detection of carbon dioxide, used in greenhouse farming agricultural production, production warehouse, laboratory, family, etc.1200mAh capacity battery for long working time, Type-C charging interface, easy charging.CO2 measuring range: 400-5000ppmTemperature measuring range: 0-50Humidity measuring range: 0%-99%RHSensor: semiconductor sensorBattery: 3.7V, 1200mAhcolor:WhiteMaterial:ABSsize:70 x 90 x 35 mmPackage Contents:1 x Air Quality Analyzer1 x USB Cable1 x English manualOnly 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 +/- 1-3cm.