It's amazing how quickly car tires lose air over time. This pump is useful for pumping air into car and bicycle tires on a regular basis. The pump has 4 individually adjustable settings that can be selected at the push of a button. My van requires 36psi so I programmed the 1st setting (Auto) to 36psi. I leave the second setting (bike) programmed at 20psi. These settings can be changed simply by pressing a button. When inflating my van's tires, the pump automatically stops at 36psi, and when using the bike settings, it stops at 20psi. With a full charge, I was able to inflate the tires on both of our machines. I deducted a star because I had to replace the 1st pump due to unstable pressure readings. The second works fine.