Features: [MULTIFUNCTIONAL & SCIENTIFIC]air quality monitor accurately assesses multiple measures of air quality including concentrations of formaldehyde (HCHO), natural & synthetic volatile compounds causing most odors (TVOC), and fine particulate dust matter measuring Less than 2.5 microns in size (PM2.5) which travel deeply into the respiratory tract, reaching the lung alveoli and can worsen asthma.[PORTABLE TESTING]This easy-to-carry air quality tester can help monitor air quality , in the car, and in hotel rooms.[ADVANCED FAN & SENSORS]This air quality monitor has a built-in fan to quickly draw in air to allow REAL-TIME measurements. It incorporates a laser-sensor to measure levels of dust particles and has a second electrochemical semiconductor sensor to measure formaldehyde and natural/synthetic compound levels.Detection range: (0-500) PM2.5 ( 0-999 /M ) HCHO(0.001-1.999Mg/M) TVOC(0.001-9.999Mg/M)Power supply:rechargeable -battery 2000mahColor: BlackMaterial: ABSPackage Contents:1X Air Quality Monitor1X USB charging cable1X English ManualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.