Universal 4pcs Auto Car Tire Preure Monitor Alarm 2.4 PSI Air Alert Cap Valve Stem Caps Sensor Indicator Tire External Tools Description: Material: stainle steel + plastic Size: 2.3 * 1 cm Color: as shown Suitable for: cars, motorcycles Quantity: 4 PCS/set Packaging includes: 4 * Automatic valve cap Features: Condition: 100% Brand New and High Quality ! Tire Preure Monitor Valve Stem Cap Sensor Indicator 3 Color Eye Alert New Preure: 2.4 PSI Fit on any standard size existing tire valve stem Visually alerts you when the tire preure is low to help avoid premature tire wear or blowouts from under- inflated tires Indication : 1.Greenshows that tire preure is normal. 2.Yellowshows that the preure is down about 5 pounds. 3.Redalerts you that the preure is down by at least 10 pounds. Package Included: 4 X Tire Preure Monitor Valve Stem Notes: 1. Due to the difference between different monitors, the pictures may not reflect the actual color of the item. 2. Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement. 3. Please leaving a meage before you give the bad feedback, if the products have some problems. Thanks for your understandings.