Reviewing the CZK-3665 Rechargable Portable Tire Inflator 

They work well. Used it on car tyres, trailer, and motorcycle tyres. Great for riding my car and dirt bike on beaches..can re inflate on returning to road.

Mine is stuck on “CAL” on the digital screen, what do I do?

You should also add recharging Tire inflator with USB, its time taken and how to secure it. I liked the video. Thank you!

Thanks