Update. Still impressed, pumped up the tow truck's tire from 30psi to 75psi. It worked perfectly, it took about 5 minutes. The pump never went off, so far so good. Seems to be a quality device. I inflated 1 tire to 35psi. I give 4 stars because I have an oxyfuel jumper. I think it's wrong to show this photo while escaping the sweater if it's not possible. The jumper outputs 12V 10 amps. It draws 12V 15Amp. If you try to reset the jumper, the pump will just turn off.