This pump is great for limited applications. This is a great little pump when you need to relieve tire pressure. I would not recommend it for inflating many tires as it is battery only and due to its small size does not produce large amounts of air when in operation. It has some great features like presetting the pressure you want, reading the actual pressure, and a small LED display. You feel like your tire is flat and you are in low light conditions. You take out this pump, set the desired pressure, turn on the LED to see where the shaft is and plug in your device. The pump now displays both the current pressure and the set pressure. You turn it on and go. After a few minutes (or seconds, depending on how much air you need), the device will turn off automatically. You pull it off and put the cap back on and you're done.