Feature 1Accurate Measurement: The far infrared air sensor is used, which can measure more accurately. 25 in 1: It can detect five parameters of CO2, temperature, humidity, HCHO, TVOC, and realize effective detection. 3Good Heat Dissipation: Sufficient ventilation holes not only accelerate the convection between the air and the machine, but also provide good heat dissipation. 4Alarm Mode: You can manually set whether it is in alarm mode, press and hold the "power" button on the right side for 1 second to turn on/off the audible alarm, if the CO2 concentration exceeds 1000ppm, the audible alarm will be triggered. 5Gravity Device: With gravity device, it can be viewed both horizontally and vertically, you can place it as you like. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Item Type: Air Quality DetectorMaterial: ABSProduct Size: Approx. 88 x 70 x 35mm / 3.5 x 2.8 x 1.4inWorking Voltage: 5vMaximum Power Charging Current: 500mACo2 Detection Range: 400-5000ppmTVOC Detection Range: 0-2.0 mg/mHCHO Detection Range: 0-0.6 mg/mTemperature Measurement Range: 0-50Temperature Measurement Accuracy: 1Humidity Measurement Range: 0%-99%rhHumidity Measurement Accuracy: 2%rhBattery Type: Built In Lithium Battery 1200 mAhCharging Time: 3hFully Charged Working Time: 7-9h (Approximately)Charging Method: USB ChargingScope of Application: Home, Restaurants, Educational Institutions, Fitness Clubs, Schools, Libraries, Etc.Weight: Approx. 163g / 5.7ozPackage List1 xAirQualityDetector1 xUSB ChargingCableNoteTake out the box for the first time, in order to read accurate data, read the data half an hour after the power is turned on; plug it into the USB for charging after booting. Test data will be more accurate after 24 hours