Product name: Tire pressure cap for vehicle, tire pressure monitoring warning Material: Metal stainless steel + PC Size: 2.3X1.1cm Applicable models: Universal size Appearance shape: Portable mini type Tire pressure gauge accuracy type: high precision Specifications: 4 pcs/set, suction card packaging, upgraded version with anti-theft nut, small wrench Features: Improve fuel efficiency, ensure normal tire pressure, reduce tire friction, and extend service life Instructions: Safety,Standard tire pressure, 2.2-2.4bar. Warning,10% lower than standard, 1.9-2.1bar. Danger,25% below the standard, below 1.8