I returned my first one as it was clearly used and badly scratched. I wanted to give the seller a second chance, so I ordered again. When I received my second device, the storage bag that came with it was torn and the plastic part on the pump was falling off. The unit looked new so I just snapped the loose piece back into place (I assumed it had come loose during shipping). The bag is new, but the zipper is poorly sewn (not critical). I decided to try an air compressor and come back if it didn't meet my expectations. I was just lucky, a few days after receiving my device I had a flat tyre. After fitting the spare tire I noticed that the tire pressure was too low. I pulled out my new air compressor, plugged it into the cigarette lighter and connected it to the valve stem on the tire. This little car vented my spare tire right away and stayed cool afterwards. Only time will tell if it will hold up or fall apart, but for now it satisfies my needs. I only gave four stars because of the bad seams and the plastic part fell off.