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AIR ALERT TIRE VALVE CAP INSATRUCTIONS: 1.Remove vehicle's black valve cap 2.Screw the pressure indicator tightly onto the valve stem. 3.Green indication bar - tire pressure at Normal range.If not,please check the tire pressure for your safety. Material: Copper, aluminum alloy, plastics Pressure Range: 30psi, 2.0Bar; Size: Approx. high2.5cm(1in), dia.1cm(0.4in) Color Indication: Green display = Pressure Normal (Greenshows that tire pressure is normal.) Yellow display = Pressure Warning (Yellowshows that the pressure is down about 5 pounds.) Red display = Pressure Dangerous (Red alerts you that the pressure is down by at least 10 pounds. ) Package Included: 4 pcs Tire Pressure Indicator Valve Stem Caps Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package:4 x Air Alert Tire Valve Cap