1The monitor raises or lowers the fan speed to optimal levels, thus keeping your air new while not using unnecessary power. 2The maximum working noise in sleep mode was only 22 decibels, quieter than a whisper or even a small public library. 3The 3in1 high efficiency particulate air filter removes solid particles such as PM2.5, pollen, mist, dust, pet dander, and particles as small as 0.3 microns. 4It can also remove odors, smoke and methanol. 5The air purifier can be charged by a USB cable, you can carry it with you anytime, anywhere, such as bedroom, car, and office. Condition: 100% Item Type: CarAirPurifier Model:GXZ-AP02 Material: ABS+ Hardware Circuit Board Weight: Approx. 445.0g Input voltage: DC5.0V- 6.0vmax ( 10%) Operating Current: 400-850mA Service Power: 4.5W Fan Operating Current: First gear /450mA; Second gear / 600 a; Third gear / 820mA ( 10%) Fan Service Power: First gear/2.25W; Second gear /3W; Third gear / 4.25 W; NegativeIon Concentration: 8 x 10PCS/cm3 (test at 100cm from emitter) Ozone Concentration:1 xCarAirPurifier 1 x Manual 1 xData Cable 1.Pleaseallow1& 8209;3cmerrorduetomanualmeasurement.Thanksforyourunderstanding.2.Monitorsarenotcalibratedsame,itemcolordisplayedinphotosmaybeshowingslightlydifferentfromtherealobject.Pleasetaketherealoneasstandard.