Product name: Tire warning Packing: 4pcsset Weight: 32gSize: 2.5*10 Product features: Tire pressure warning cap is an auxiliary tool for measuring tire pressure. It locks the tire pressure cap on the tire valve and directly displays the color change in the transparent cover. Instructions 1. Unscrew the original gas 2. Screw on the tire pressure cap of this product, it will display red or yellow when it is not tightened or the tire pressure is insufficient 3. When the tire pressure is normal after tightening, it will show green Standard tire pressure is 2.4bar Instructions for use Normal: In the case of standard tire pressure, the transparent window should be green, and the vehicle should drive normally Warning: The tire pressure is slightly lower than the standard by about 10%, and the transparent window is yellow-green, and it should be inflated in time. Danger: The tire pressure is about 25% lower than the standard, the transparent window should be yellow, and it should be checked and inflated immediately. A 15% reduction in tire pressure will cause your car to increase fuel consumption by 6% and double tire wear, thereby increasing the risk by 30%. The tire pressure cap will remind you of this aspect The hazards of insufficient tire pressure The tires are soft, and the contact area with the ground is too large, and the fuel consumption increases. The tire contact surface is deformed greatly, and it takes a long time. Lu Liangniang's curtains in the tire are fatigued, which affects the service life. The contact surface becomes larger, which will increase the possibility of tire puncture The braking performance is low, which affects the operation of the vehicle.