The compressor exerts wide of use, such as tire of vehicle, autoengines and bicycle, balls, toysand boats, etc.It is good for the emergency needs when you are on highway and countryside road or rush for office on the morning while the tire low pressure.Convenience to put it in truck of car and not occupy any space.The appropriate tire pressure not only save gas but also ensure the safety of driving.Usage:1. Insert power cord into cigarette lighter receptacle of vehicle.2. The bettery clip to the DC12V battery positive and negative pole, and open the car engine.3. Push connector of the compressor toward value stem of tire.4.The guage will indicate the pressure, usually 28-35PSI, stop engine, not insert power cord and remove the connector from value stem.Notices:The electric source is DC12V. 110V family electric source is prohibited unless with a transformer.To keep the good opration of the compressor, it should be not being works more than 10 minutes. If the comperssor continuously works more than 10 minutes, should be cool it for 10 minutes to avoid damage the engine and ports.Important Point:The machine starts a large current, do not connect the tire in the case of open the power switch, it may be due to start the current is too large to burn the car fuse. The correct operation is to turn on the power first , until the pump starts normal work, then connected to the tire inflatable. If you need to turn on the power after the power is turned off, you should also remove the air nozzle and then turn on, otherwise it may burn the car fuse.Package Includes:1 x Car Air Compressor, Some Parts