it can not drive the purifier directly if battery out of power.means that the purifier motor have to drive via the battery . Battery can be charging via car usb (about 3 hours)or solar power (about 12 hours,depend on the sunlight intensity ) . Double click the power button to switch working mode ;sigle click the power button to switch wind speed mode HEPA filter recommend 3-6 month to replace according to the use situation Eliminate health threats and hidden dangers please attention that the solar panel main function is assistance charging and extend the battery duration of use. Function : Car interior Air purification Power:2.5 (W) Recommended area :10 () Rated voltage :5 (V) Battery capacity 1200mah Negative ion emission 5000000+/m3; Physical dimension :152.5mm*136mm*27.4mm Strong formaldehyde removal,odor eliminator for car 5000000+/m3; negative ion emission, scientific air purification ,deodorization Efficiently . Colour:black Material:ABS Package Contents: 1 x Machine 1 x Charging cable 1 x Installation kit Only the above package content, other products are not included. Note: Light reflection 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.