1、MAIN FUNCTIONS: The meter can quickly and accurately detect indoor CO2 concentration, temperature and humidity, and suitable for home or office use. 2、HIGH EFFICIENCY: The air quality monitor adopts non dispersive infrared technology, with temperature range correction, high measurement accuracy and quick response. 3、4 STAGES DISPLAY: The detector is designed with 4 stages of CO2 concentration, green for good stage, orange for warning stage, yellow for dangerous stage, final red stage. 4、WITH BATTERY: Built in 2000mAh large capacity battery, which can be used continuously for 14 hours (5 hours under the maximum brightness), with USB cable for fast charging. 5、APPLICABLE PLACES: The CO2 detector is wall mounting, applicable to bedroom, kitchen, office, school, in car, cellar, planting room, camping place and meeting hall. 6、LED SCREEN: The indoor air monitor adopts LED screen display, with high brightness, clear and intuitive, can ensure clear reading even if installed at a high place. Item Type: Air Quality Monitor Display Method: LED screen display Atmospheric Pressure: 86-106Kpa Sampling Time: 1.5 seconds Detection Temperature: -10-50℃ Temperature Accuracy: ±1.0℃(0-40℃) Temperature Unit: Celsius Storage Temperature: -10-60℃ Detection Humidity: 20%-85% Humidity Accuracy: ±5% CO2 Detection Method: Infrared CO2 Concentration Unit: PPM CO2 Detection Range: 400-5000ppm CO2 Detection Accuracy: 400-1000ppm, Deviation: ±50ppm; Above 1000ppm, Deviation: ±5% Resolution: 1ppm CO2 Alarm Value: 1000ppm Support manual setting of 800-2000ppm CO2 alarm threshold. CO2 alarm on and off function (if the user does not like the alarm, people can turn it off) Battery: 1 x 2000mAh Battery(built in battery) Indicator Light: Green: 400-1000ppm Orange: 1001-2000ppm Yellow: 2001-3000ppm Red: 3001-5000ppm 1 x Host 1 x User Manual 1 x Installation Sticker 2 x Screws 2 x Expansion Pipes 1 x USB Cable