Vexverm 4PCS 2.4Bar 36PSI Car Auto Tire Pressure Monitor Valve Stem Caps Sensor Indicator Eye Alert Diagnostic Tools Kit Feature:Material: Stainless steelPressure Range: 2.4Bar/36 PSIFit 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.Size:2.5cm x 1cm Color Indication:Green shows that tire pressure is normal.Yellow shows that the pressure is down about 5 pounds.Red alerts you that the pressure is down by at least 10 pounds.Material: Stainless steelPressure Range: 2.4Bar/36 PSIFit 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.Size:2.5cm x 1cm Color Indication:Green shows that tire pressure is normal.Yellow shows that the pressure is down about 5 pounds.Red alerts you that the pressure is down by at least 10 pounds.