I got one of these at WalMart for around $7 and it's TOTALLY WORTHLESS (except for the flashlight which does work). It's actually worse than worthless because having one of these in your car for an emergency will make you think you have the capability to inflate a flat spare, for example, when in fact there's a good possibility you might not be able to. This cheap compressor took 10-15 min to get a few psi into a tire a year or so ago when it was new (it bounced around on the ground a bit if I recall correctly) and I just tried it again today and ran it for 15-30 minutes and the needle didn't even get off zero, even though I tried repositioning the hose nozzle on the schraeder valve. It was relatively quiet though but that doesn't matter when it won't pump any air. I'd suggest paying a little more for a better compressor that will suit your needs best (~$40-$130) or consider using a good foot pump (~$10-$30), depending on what your needs are.