Just used this for the first time! It's so great to be able to inflate your tires without leaving home. That should be in every car. So easy to use right out of the box. You mount PSI tires, place the grip on the tire, press "Start" and that's it! The machine switches off automatically! No guesses! It's small, light weight, comes in a cute black pouch and also has needles for inflating sports balls! Also, forget there's a little backlight on the side in case you use it in the dark! What more do you want! Highly recommended!