This two pack tire inflator is just what I needed to replace the old one we had in the garage. The last time we inflated my tires the air blower broke, it was pretty old and rotting so it wasn't a surprise. I really like this new digital air inflator as it shows exactly how much air is in the tires so you know how much more to add. Yesterday I parked my car in the driveway and installed an air hose, then added this pump and pumped air into my tires. I'm not very mechanically inclined, but I found this a fairly easy task. At first I thought something was wrong because although the air comes out very quickly I expected it to be quite noisy but it wasn't at all. The part that attaches to the tire nipple attaches and detaches easily and holds up well while you add air. This tool requires one AAA battery to operate the digital portion so you can see what you are doing. My husband hid these two tools securely in the back of his tool box so no one would use them or steal them.