4/8Pcs Car Auto Tire Pressure Monitor Valve Stem Cap Sensor Indicator Warn 36psi Feature: Tire pressure cap is an auxiliary tool for measuring tire pressure, locking tire pressure cap  on top of the tire air nozzle, look directly at the color change in the transparent cover to judge the adequacy of the tire pressure, eliminating cumbersome of  detecting by instruments. If a 15% reduction in tire pressure will cause your car to increase 6% of fuel consumption and twice tire wear , thereby increasing the risk by 30%. The tire pressure cap will remind you to pay attention to this.  Product Description: 100% brand new and high quality Material: Chromed Metal Simply install on the air valve According the recognize color to display the pressure of the tire Fit on any standard size existing tire valve stem Visually alerts you when the tire pressure is low to help avoid premature tire wear or blowouts from under-inflated tires Usinging it makes the tire of your car more safety Easy to control and install Tire Pressure: 2.4Bar  (The tire pressure cap can be used for 2.5bar standard) Color: As the picture show Size: Approx. 2.3 x 1cm/ 0.91" x 0.39" (L*D)   Indication: Green shows that tire pressure is normal; Yellow shows that the pressure is lower about 10 percent than the standard; Red alerts you that the pressure is lower about 25 percent than the standard.   Package include: 1 Set of Tire Pressure Indicator(1 Set= 4pcs or 8Pcs )