Feature:1. Multifunctional: This air monitor uses semiconductor, infrared and electrochemical detection technology with CO2, TVOC, HCHO PM2.5 and PM10 detection functions.2. USB Charging: This indoor CO2 monitor adopts USB charging, 24 hours uninterrupted, work plug and play, free from worrying about the trouble of running out of power.3. Accurate Inspection: This air quality tester has openings on both sides and the back to form convection air, which makes real time convection inspection more accurate.4. Excellent ABS Material: This air quality monitor is made of excellent ABS material, which is strong and wear resistant, not easy to be damaged and has a long service life.5. Backlight LCD Screen: This indoor air quality meter comes with a backlighted display screen that provides a clear display and easy readings.Specification:Item Type: Air Quality MonitorMaterial: ABSDetection Technology: Semiconductor, infrared, and Electrochemical Detection TechnologyApplicable Temperature: 0-70Display Mode: LCD, BacklightSensor: PM2.5 Sensor, Semiconductor Sensor, Electrochemical SensorBattery: Rechargeable Lithium Battery 1200mah x 1 ( Shipped With Built In Battery )PM2.5: 0-999 ug/mPM10: 0-999 ug/mHCHO:0-9.999mg/mTVOC: 0-9.999 mg/mCO2: 400-5000 PPM.Package List:1 x Air Quality Monitor1 x USB Cable1 x Manual