Feature: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.Specification:Item Type: Air Quality MonitorDisplay Method: LED screen displayAtmospheric Pressure: 86-106KpaSampling Time: 1.5 secondsDetection Temperature: -10-50Temperature Accuracy: 1.0(0-40)Temperature Unit: CelsiusStorage Temperature: -10-60Detection Humidity: 20%-85%Humidity Accuracy: 5%CO2 Detection Method: InfraredCO2 Concentration Unit: PPMCO2 Detection Range: 400-5000ppmCO2 Detection Accuracy: 400-1000ppm, Deviation: 50ppm; Above 1000ppm, Deviation: 5%Resolution: 1ppmCO2 Alarm Value: 1000ppmSupport 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: 400-1000ppmOrange: 1001-2000ppmYellow: 2001-3000ppmRed: 3001-5000ppm.Package List:1 x Host1 x User Manual1 x Installation Sticker2 x Screws2 x Expansion Pipes1 x USB Cable