Features Advanced technology of Laser Sensor Detection detect PM2 5 in Air and transform into digital display accurately show different healthy level warning in different color Excellent for daily air quality monitoring Detect PM2 5 by laser scanning giving results more stable and accurate than infrared sensor detection Rechargeable built in battery with 1200mAh high capacity support 4 6 hours continuous running Mini size only 76 76 46mm easy to carry and can be put on anywhere you need Applicable for many occasions office home garden in car etc Keep track of the air quality around you Specification Material Acrylic ABS plasticSize 76 76 46mm 3 0 3 0 1 8inchWeight approx 100gColor BlackBattery 1200mAH lithium batteryWorking voltage 3 7VInput 5V 1ABattery life 4 6 hoursDisplay screen OLED screenWorking temperature 20 50℃Feature Small and exquisite Durable battery Package included 1 x Air Quality Detector1 x User Manual1 x Clean Cloth Details pictures