Item Type: Air Quality Detector Material: ABS Product Size: Approx. 88 x 70 x 35mm / 3.5 x 2.8 x 1.4in Working Voltage: 5v Maximum Power Charging Current: 500mA Co2 Detection Range: 400-5000ppm TVOC Detection Range: 0-2.0 mg/m3 HCHO Detection Range: 0-0.6 mg/m3 Temperature Measurement Range: 0-50 Temperature Measurement Accuracy: 1 Humidity Measurement Range: 0%-99%rh Humidity Measurement Accuracy: 2%rh Battery Type: Built In Lithium Battery 1200 mAh Charging Time: 3h Fully Charged Working Time: 7-9h (Approximately) Charging Method: USB Charging Scope of Application: Home, Restaurants, Educational Institutions, Fitness Clubs, Schools, Libraries, Etc. Weight: Approx. 163g / 5.7oz 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.Take 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 hours1 xAirQualityDetector 1 xUSB ChargingCable