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Operation Step: 1.Start the car engine. 2.Insert cigar lighter plug into the car's cigarette lighter socket. 3.Connect the appropriate air horse nozzle with tire valve. 4.Switch the unit you want with the button "R" and set your desired pressure with the button "+"/"-". 5.Turn the switch on and wait. 6.The air pump will shut off automatically once reaching desired pressure. *If the tire inflator stops inflating in using process,turn off the switch and unplug the power cable,then repeat step 2 though 4 to restart the pump. NOTICE: 1.The air compressor only works with DC12V power supply. 2.Please start the car before turning on the air compressor 3.Please turn off the air compressor and cool it down for 3 minutes after continuous working for 8 minutes.