Features: 1. Tire pressure prompt: When the tire pressure is too low, there will be a visual prompt to prevent premature tire pressure wear or tire blowout due to insufficient tire inflation. Compatible with 32 PSI (2.2 bar), suitable for cars, motorcycles, bicycles, etc. When removing the cover. Make sure not to lose the black gasket. They fall off easily and are hard to find. It is recommended to remove it before ordering the car from the garage. 2. Improve fuel efficiency: Improve road handling, increase economy and prolong tire life. Improve fuel efficiency, safety and control. The recommended pressure is 36 pounds per square inch. Just install it on the valve. 3. Anti-theft function: This tire pressure detection cap has a new generation of copper core design, the brass core is of better quality, more sturdy and durable, hard to be damaged, professionally designed, with anti-theft function. 4. Prevent bumps: The car tire pressure monitoring valve cover helps prevent bumps from premature tire wear or under-inflated tires, improving fuel efficiency, safety and controllability, and extending tire life. 5. Different tire pressure display: green, yellow, red system indicates the correct inflation level of the tire. The tire pressure is displayed in the color identified, green means the tire pressure is normal. Yellow means the pressure is 10% lower than standard. Red alerts you to stress 25% below the norm. The car tire pressure monitoring valve cover helps prevent bumps from premature tire wear or under-inflated tires, improving fuel efficiency, safety and controllability, and extending tire life. Specifications: Material: Chrome-plated metal, brass core Size: 2.3*1cm Type: all copper core high precision Package Included: 4pcs *valve caps Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object. 1. Tire pressure prompt: When the tire pressure is too low, there will be a visual prompt to prevent premature tire pressure wear or tire blowout due to insufficient tire inflation. Compatible with 32 PSI (2.2 bar), suitable for cars, motorcycles, bicycles, etc. When removing the cover. Make sure not to lose the black gasket. They fall off easily and are hard to find. It is recommended to remove it before ordering the car from the garage. 2. Improve fuel efficiency: Improve road handling, increase economy and prolong tire life. Improve fuel efficiency, safety and control. The recommended pressure is 36 pounds per square inch. Just install it on the valve. 3. Anti-theft function: This tire pressure detection cap has a new generation of copper core design, the brass core is of better quality, more sturdy and durable, hard to be damaged, professionally designed, with anti-theft function. 4. Prevent bumps: The car tire pressure monitoring valve cover helps prevent bumps from premature tire wear or under-inflated tires, improving fuel efficiency, safety and controllability, and extending tire life. 5. Different tire pressure display: green, yellow, red system indicates the correct inflation level of the tire. The tire pressure is displayed in the color identified, green means the tire pressure is normal. Yellow means the pressure is 10% lower than standard. Red alerts you to stress 25% below the norm.