Sell Car Tire Pressure Gauge Cap 4pcs Wireless Detection Alarm Monitoring Valve Detector Monitor [Dg21 best price

Quantity: 1 group of 4 How to use: 1.Turn on the existing valve cap 2.Adjust the tire pressure to the original factory suggested range. 3.Turn this cap to the tire valve 4.Regular check indicator cap 5.If the color shows yellow-green or red-yellow, it means that the tire air pressure is insufficient, and the tire should be inflated to the correct Note: Usually keep the valve cover clean for easy observation of color