Description of 12V Air Compressor This portable air compressor has a small electric motor that compresses the air in a small attached cylinder tank. It can be plugged into a 12V car system for on-the-go repairs or inflation. It's ideal for car and bicycle tires, sports balls, airbeds and inflatable toys, etc. Because it can be powered through a cigarette lighter in your vehicle, it is incredibly versatile and a lifesaver in some instances.