It cannot drive the purifier directly if the battery is dead. This means the purifier's motor must be powered by the battery. The battery can be charged via the car's USB port (about 3 hours) or solar energy (about 12 hours, depending on the sunlight intensity). Double-click the power button to switch the working mode; Simply click the power button to switch wind speed mode HEPA filter recommends 3-6 months to replace it depending on the usage situation Eliminate health threats and hidden dangers Please note that the main function of the solar panel is to help charge and extend the battery usage time. 100% Brand New Function: Car Interior Air Purification Power: 2.5 (W) Recommended Area: 10 (㎡) Rated Voltage: 5 (V) Battery Capacity 1200 mah Negative Ion Emission 5000000+/m⊃3; Physical Dimension: 152.5mmx136mmx27.4mm Strong Formaldehyde Removal, Car Odor Eliminator 5000000+/m⊃3; Negative ion emission, scientific air purification, effective deodorization. Color:Black Material:ABS