4Pcs/set Cars Tire Air Pressure Monitor 3 Color Alert Indicator Tire Valve Cap Gauge

These are safety hazards. I received them faulty. Air leaking from the cap. Very bad quality and bad quality checks from the manufacturer. Also I don't see the yellow colour, only red and green. Even though one does not make the sound of air leakage, the tire still deflated within 24 hours.

Unable to determine what pressure these were meant for, package did not indicate nor did ordering choices Tires require different pressures so it's important to use correct one..

These are, in a way, a good idea. The big problem is that the top can easily break off, and when it does, the tyre deflates. Yes, it happened to me, very inconvenient.

Have not put them on yet, but certainly look the same as photos. If they work as they are supposed to they will have been a bargain.