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 Monitor Material: ABS Detection Technology: Semiconductor, infrared, and Electrochemical Detection Technology Applicable Temperature: 0-70℃ Display Mode: LCD, Backlight Working Voltage: 5V Sensor: PM2.5 Sensor, Semiconductor Sensor, Electrochemical Sensor Battery: Rechargeable Lithium Battery 1200mah x 1 ( Shipped With Built In Battery ) PM2.5: 0-999 ug/m³ PM10: 0-999 ug/m³ HCHO:0-9.999mg/m³ TVOC: 0-9.999 mg/m³ CO2: 400-5000 PPM. Package List: 1 x Air Quality Monitor1 x USB Cable1 x Manual