Adjust the pressure unit using the "M" button, then set your desired pressure with the "+" and "-" buttons. The compressor will automatically shut off when it reaches the set pressure (make sure it"s higher than the current tire pressure). It inflates car tires rapidly (35 L/Min), taking under 5 minutes to inflate a 195/55/R15 tire from 0 to 35psi. The device provides accurate readings within 1.5% of your tire"s pressure. It offers one-click unit change, a backlit LCD screen, an integrated LED flashlight, and a 10ft car cigarette lighter cord. Note that it requires a converter for wall plug use (not 110V AC plug). It suits various applications, inflating Schrader valves on cars, SUVs, motorcycles, and certain bicycles. It comes with 2 nozzles, 4 tire valve caps, and an extra fuse. However, it is not suitable for high-pressure or large-volume uses like inflatable canoes or pools.