Features: Ensures road safety with these 4 Tire Pressure Monitoring Caps featuring real time detection via high precisions sensors, instantly alerting driver of pressure deviations through color coded indicators (green/yellow/red). Crafted from plastic metal composite, these leak detection caps offer easy installation with a simple twist on design for various weather conditions. Ideal for safety conscious driver, and fleet managers seeking tire pressure check tools for vehicles. Provides continuous monitoring during highway drives, commutes, or prolonged vehicle storage to prevent underinflation related accidents and tire wear. Combines low power consumption technology, delivering year round protections while minimizing battery replacements and maintenance efforts. Specifications: Component: Plastic + Metal Size: about. 0.99x2.29cm/0.39x0.9in Package Includes: 4pcs Tire Pressure Monitoring Cap note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.