Description: Simply mount this tire pressure monitor valve on the air valve and it will help you identify tire pressure by displaying the color through the transparent window. Built-in leakproof sealing ring effectively prevents the tire from leaking. The design of the gears can increase the friction and play the effect of anti-slip. Using high-quality plastic and metal, the tire pressure monitor valve is durable. Compact tire pressure valve stem is 3.5cm long and 1cm wide. It can fit any standard size tire valve rod. Specification: Item Name: Tire Pressure Monitor Valves Material: Plastic, Metal Color: Silver Features: Pointer Display, Compact Size, High Accuracy Size Details: Size: 3.5cm x 1cm/1.38 x 0.39 (Approx.) Notes: Indicator: Normal: Under standard tire pressure conditions, the transparent windows should be green, and the vehicle is driving normally. Warning: The tire pressure is slightly lower than the standard by about 10%, and the transparent window is yellow-green. You should inflate in time. Danger: The tire pressure is about 25% lower than the standard. The transparent window should be yellow-red, and it should be checked and inflated immediately. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 4 x Tire Pressure Monitor Valves