My left rear tire was only 28psi. It rang, it was Revane. I'll bring my Ryseab compressor. Charged up, went to the shop to inflate a tire. Went from 28psi to 36psi in a few minutes. I was about to unscrew the air hose and noticed that it heats up but cools down. Works perfectly! I used it for 5-6 minutes. And it was hot, but it cools down pretty quickly. Aside from the heat issue, it reaches the set psi fairly quickly and shuts down. Definitely worth the money. Maybe something for Christmas presents. Tires, bikes, pool floats etc. Definitely a must see. No external power required. C-Port charges fairly quickly. Today I picked up the car from the car service. Due to inactivity, each tire was only 26 psi. I charged all 4 tires to 35psi in less than 10 minutes. πππππ