Car Tire Valve Cup, INCART 36 PSI 2.4 Bar Air Alert Motorcycle Car Tire Pressure Monitoring Stem Valve Cap Sensor Indicator 3 Color Eye Alert (4 Pcs) Model: 36PSI(2.4 Bar), Material: Stainless steel, Visually alerts you when the tire pressure is low To help avoid premature tire wear or blowouts from under-inflated tires Green indication bar - tire pressure at Normal range.If not,please check the tire pressure for your safety Enhances road handling, increases economy, extends tire life,Increases fuel efficiency, safety and control Red and Yellow indication bar - tire pressure at below 2.0 Bar(Less than 75% of the standard),DANGER; Yellow and Green indication bar - tire pressure at 2.3 - 2.0 Bar(Less than 90% of the standard),WARNING; Green indication bar - tire pressure at Normal range(2.4 Bar),SAFE