Stops working after first use. It's most likely a fuse, but the manual doesn't say how to change it. Must go back. The 1st time worked well although the display was difficult to read and showed more psi. Reading 38 my tire gauge was 35. Edit: Found the fuse had fallen out where the end goes into the cigarette lighter. The end is screwed in and is dangling for some reason. Luckily I found 3 parts, put them together, plugged them in and it worked. Make sure the end is screwed on tightly. It only took a few minutes to go from 32 to 36psi where I fire to maintain air pressure.