Works as advertised. However, there are a few key downsides. First, the inflation cord is about 6 inches long. If the channel stem isn't at the bottom of the tire rim, you'll have to stand and hold that thing for as long as it takes. I prefer to put it on the floor and just wait for it to stop automatically. A battery can't beat two cars or eight tires. I had to go back and charge it to use on our daughter's car. While its build and quality appear decent, it's not worth the asking price. There are many other devices that offer much longer hoses for a fraction of the cost. I'm having trouble figuring out why it's 79.99.