Package Included:<br />1 x PM2.5 Air Quality Detector<br /> 1 x USB Cable<br /><br />A1/B1<br />Used in detection of PM1.0， PM2.5， PM10.0， AQI，temperature& humidity， suspended particulate matter.<br />A3/B3<br />Used in detection of PM1.0， PM2.5， PM10.0，