Carbon dioxide detector: Intelligent carbon dioxide value tester. The gas analyzer uses a semiconductor detection sensor with a large hollow design, which can better air convection, and the detection value can be fast and accurate. Full-color large screen display: power, CO2 value, temperature and humidity, different font colors display different air quality, green 400-450ppm, blue 451-700ppm, purple 701-1000ppm, yellow 1001-2000ppm, red 2001-5000ppm . Multiple vent design: There are vents on the upper left and right rear, which accelerate the convection between the air and the machine, thus realizing effective detection, and also providing good heat dissipation effect and prolonging the service life of the battery. Power supply mode: Built-in built-in lithium battery 1200mAh battery, fully charged for 3 hours, can be used for 5-7 hours, equipped with USB data cable charging, can be used while charging. Can be hung on the wall: There are 2 hanging holes on the back, which can be hung directly on the wall, which is convenient for viewing data and does not take up space. It is very suitable for simulating offices, bedrooms, living rooms and other places. Specifications: Name:AirQualityMonitor Detectionrange:400-5000PPM Productsize:about7*9*3.5cm/2.76*3.54*1.38in Detectiontechnology:semiconductordetection Applicabletemperature:0~70C Displaymode:LCDdigitaldisplay+LCDscreen+backlight Detectionrange:400~5000PPM Workingvoltage:5V Batterycapacity:1200mAh Chargingport:Type-C C02indicator:0~799PPM:greenlightflashes 800~1199PPM:lightgreenlightflashes 1200~1599PPM:orangelightflashes 1600~1999PPM:redlightflashes Above1999PPM:4colorsflashesatthesametime PackingList: AirQualityMonitor*1 USBCable*1 Manual*1 Notes: Duetothelightingeffectsandshootingangles,thecoloroftheitemandthatshowninthepicturemighthaveanuance. Duetomanualmeasurement,theremightbeatoleranceintheproductsize.