Usage Tips:[9 in 1 MULTIFUNCTIONAL AIR QUALITY MONITOR ] upgraded indoor air quality monitor that can accurately assesses multiple measures of air quality including concentrations of formaldehyde (HCHO), PM2.5, PM1.0, PM10, HCHO, TVOC, temperature, humidity, AQI, Date/Time. It's very necessary for you to know the air quality of your living place[PORTABLE AIR DETECTOR] Spot check indoor air quality anywhere or leave device on for continuous monitoring,This easy-to-carry air quality detector can help monitor air quality at home, kitchen, bedroom, office, school, car, hotel, travel, camping etc. especially in which has baby,child and pregnant woman.[EASY OPEARATION] This air monitor is easy to operate with just pressing the functional button, Updated user manual is very simple and easy to understand. The intelligent air tester can monitor the variety of the environment in a period your care about,You can take it anywhere to monitor air quality. At the same time, you can set a standard value of formaldehyde. If the density is higher than standard value, the device will alarm.Input voltage:5.0V/1000mACharging temp:-10-45FormaldehydeTest object range:0-1.999mg/m3Test tech:semiconductor sensorSample type:ciffusion typeConcentration unit:mg/m3Test range:0.000-9.999mg/m3Test tech:semiconductor sensorSample type:ciffusion typeConcentration unit:mg/m3Test time:5 min PM2.5/PM1.0/PM10 testTest particle population:2.5um,1.0um,10umTest particle mass:PM2.5,PM10Sample time:3 secTest method:concentration(per liter)Test range:0-999ug/m3Use environment Air pressure:86Kpa-106KpaRelative humidity:20%-85%Test temp:-10-45Storage temp:-20-50Material:plasticcolour:BlackPackage Contents:1 * Air Quality MonitorOnly the above package content, other products are not included.Note: Light 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.