... the cigarette socket DC 12V in car, then screwing the air nozzle on valve, starting generator, thus , inflation is available .When using ... ,please keep the car engine working. This type of air pump (compressor ) is fit for big tyres.The installed self ... .5 minutes. It is Water Proof.For car tire , balloon , air bed , water bed . Equip four kinds inflator connnector. AP76-1 ...