Real-time Tire Pressure Monitoring - The transparent design of the top of the car tire pressure warning cap can monitor the tire pressure in real time by observing the color change, and high-speed driving is safer. Rubber Inner Seal - All tire valve caps for wheels have rubber rings, no air leakage on long, hard drives.  Excellent Process - Zinc alloy electroplating process, no oxidation and no fading. Wide Applicatio - Universal fit for cars, SUVs, bikes and bicycles, Trucks, Motorcycles. Outdoor, All-Weather, Leakproof Air Protection Tire Valve Caps (Durable and Beautiful Sturdy Valve Caps), Check Tire Pressure Caps Fit for Cars, Trucks, Motorcycles The car tire pressure warning cap can not only prevent dust, air leakage and protect the tire, but also can be used to detect tire pressure to ensure driving safety. Adapt to Different Vehicles: Universal size is suitable for most cars, motorcycles, buses, trucks, bicycles and other vehicles. Real-time Tire Pressure Detection: Green (Normal tire pressure) Yellow (Low tire pressure) Red (Tire pressure is too low) Easy to Install: Normal: Just tighten directly, easy to install. To check the air pressure, it is easy to install or remove. Anti-theft: Screw on the gongs piece, then screw the tire warning cover, and tighten the gongs piece with a small wrench to prevent theft. Specifications: Quantity: 4 Pcs