Item Type: Air Quality Detector_x000D_ Material: ABS_x000D_ Product Size: Approx. 88 x 70 x 35mm / 3.5 x 2.8 x 1.4in_x000D_ Working Voltage: 5v_x000D_ Maximum Power Charging Current: 500mA_x000D_ Co2 Detection Range: 400-5000ppm_x000D_ TVOC Detection Range: 0-2.0 mg/m3_x000D_ HCHO Detection Range: 0-0.6 mg/m3_x000D_ Temperature Measurement Range: 0-50_x000D_ Temperature Measurement Accuracy: 1_x000D_ Humidity Measurement Range: 0%-99%rh_x000D_ Humidity Measurement Accuracy: 2%rh_x000D_ Battery Type: Built In Lithium Battery 1200 mAh_x000D_ Charging Time: 3h_x000D_ Fully Charged Working Time: 7-9h (Approximately)_x000D_ Charging Method: USB Charging_x000D_ Scope of Application: Home, Restaurants, Educational Institutions, Fitness Clubs, Schools, Libraries, Etc._x000D_ 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