This machine is suitable for all 12V car tires, especially 4x4, medium bus, 2 tons of trucks, high-class cars and other larger tires, large volume, fast inflation. -also applies to motorcycles, bicycles, balls, rubber boats, beach floating beds, inflatable toys, and so on. on the highway, in the wild, or in the morning to work, the tires suddenly leaked or the tires are injected, more able to play first aid. -car tires maintain the correct tire pressure, to ensure safe driving, and save gasoline, with the car, just in case, the endless use. -with a full set of inflatable nozzles, can be used for tires, rubber boats, air cushions, inflatable toys, ball inflatable, and many other uses. Instructions -Insert the nozzle of the rubber tube directly into the valve of the tire. When the sound of the air leaking from the tire is heard, it means that the air has already circulated, the air nozzle is continued to be tightened, and the air is no longer discharged. -remove the power cord battery clip (with no cigarette lighter plug), directly clamped in the battery positive and negative, should not touch the line short circuit, open the switch, you can inflate. (Double-cylinder air pump has high power, it can't be plugged directly into the cigarette lighter through the converter to take electricity, it is easy to burn the cigarette lighter and circuit on the car) -When inflating, the meter pointer increases with the saturation of the tire. When the pointer reaches the appropriate tire pressure (the tire pressure of the car tire is 223kpa=35PSI), the plug and the nozzle are taken out, and the work is completed. - Please use the professional ball needle and plastic nozzle equipped with this machine to connect with the air nozzle to inflate the ball and other gas-demanding equipment