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, , Date/Time. It's very necessary 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 , 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 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/1000mA Charging temp:-10-45 FormaldehydeTest object range:0-1.999mg/m3 Test :semiconductor sensor Sample type:ciffusion type Concentration unit:mg/m3 Test range:0.000-9.999mg/m3 Test :semiconductor sensor Sample type:ciffusion type Concentration unit:mg/m3 Test time:5 min PM2.5/PM1.0/PM10 test Test particle population:2.5um,1.0um,10um Test particle mass:PM2.5,PM10 Sample time:3 sec Test :concentration(per liter) Test range:0-999ug/m3 Use environment Air pressure:86Kpa-106Kpa Relative humidity:20%-85% Test temp:-10-45 Storage temp:-20-50 Material:plastic colour:Black Package Contents: 1 * Air Quality Monitor Only 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.