Feature: 1. 3 IN 1 MONITOR: Detects particulate matter(PM 2.5), humidity, and temperature. PM2.5 is a major component of air pollution, and fine particles smaller than 2.5 microns(PM2.5) can penetrate deep into the respiratory tract when inhaled 2. PROFESSIONAL ACCURATE DESIGN: This air quality meter uses advanced sensors to reflect air quality by detecting PM2.5 particles. The reasonable inlet and outlet duct design enables the internal sensor to accurately analyze each particle. The PM2.5 index is updated every 5 seconds, and the temperature and humidity are updated every 1.5 seconds for a more comprehensive understanding of air quality 3. COLOR SCREEN: Multi color screen with all round viewing technology, you can clearly see the air quality monitor display PM2.5 indicators, temperature, humidity from any angle 4. EASY TO USE: This air quality tester does everything with just 1 button, plug and play, using a MicroB USB interface 5. LONG LIFE: Air quality detector built in 1600mAh large battery, lasting life. Turn on the switch to obtain the PM2.5 index, temperature and humidity Specification: Item Type: Air Quality Monitor PM2.5 Technology: Light scattering Temperature and Humidity Technology: Temperature and humidity sensor PM2.5 Detection Range: 0-999 ug/m³ Battery: 1 x 18650 1600mah battery Display: HD LCD screen Atmospheric Pressure: 86Kpa-106Kpa Sampling Time: 1.5 Seconds Detection Temperature: -10℃ to 50℃ Detection Humidity: 20%-85%. Package List: 1 x Detector1 x User Manual1 x USB Cable