I ordered this to replace another model I gave to a friend. The device seemed cheap and very light, but I gave it a try. I read the instructions and tried pumping up my low tires. The device didn't work and just kept rebooting. Not a big deal because I know things like this happen so I asked for a replacement. The replacement unit comes and it doesn't even light up or anything. I give up, I will return both and order another model, which I really liked.