Features: USB power supply: safe and reliable, provide long-term monitoring with-non stop. The hazard degree of harmful gases such as formaldehyde and TVOC is not for a-static tracking-in order to systematically grasp the for Health of the Environment. The Air Quality Tester is widely used in homes, offices, enterprises, governments, schools etc. The Air Quality Test Formaldehyde Detector with built-in electric sensors can accurately detect carbon dioxide (CO2), formaldehyde (HCHO), volatile organic compounds (TVOC) and particulate matter (PM2.5) in-the air. These readings the detection of , harmful chemicals and pollutants in-the air. Colored screen, intelligent control , stable, quick, you can get the precise figure easily. Specifications: Material:ABS Size:Approx.16.4x6.9x4.4cm/6.45x2.71x1.73inch Safety range: Test items: formaldehyde, TVOC, temperature, humidity, and air quality-index. Product features: double sensing, automatic calibration of data recording and return, air interaction technology. Detection range: 0-1.999/MGM-(formaldehyde) and 0-1.999/MGM-(TVOC). Power-supply mode: 2000 mAh lithium-battery (with charging data cable) Working temperature:-10-45 Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Formaldehyde Detector