Review on 8PCS Tire Pressure Detection Cap | 2.2Bar 32PSI Upgrade | Anti-Theft Car Tire Pressure Monitor with Wrench & Nut | Tire Pressure Indicator Valve Stem Cap for Motorcycles, SUVs, Bikes, Trucks | Dust Stem Cover | Gold by Jacob Morrison

I bought these for my elderly mother so she can tell if the tires need air, firstly the "yellow-red" on the valve cover doesn't change until the air pressure is low enough to to see it it takes air and the plastic cap over the color indicator came off causing her tire to go flat which she was driving ruining the tire costing the price of a new tire and completely defeating the purpose of these caps. I will not recommend it.