How does the Valve Caps work?

First time you put the cap onto the valve stem it take a sample of the tire pressure and saves it into a reference chamber. If the tire pressure drops 4 or 8psi from the original pressure the cap will start flashing. It is importaint to know that we are using air pressure as a reference which means our reference pressure automaticilly follows the temperature and pressure of the tires.

Want to see how it works? Watch the video!