It's pretty good as a gauge. It runs on two AA batteries and has a choice of pressure readings. This allows you to deflate or inflate. It shows you the tire pressure and the current tire pressure. The only thing seems to be that it can break easily. It has a plastic front and back. In addition, it is accurate and easy to use. The price is about average. There are other devices at the same price that give you more options, but this is a worthy number.