Schrader SCH-BRK-4PC TPMS Retrofit Kit For Passenger Car and Light Truck (Wireless-Battery Operated Display) Kit includes 4 rubber valve snap-in style TPMS sensors, a battery operated dash mounted LCD display receiver with mounting installation and set up instructions Continuously monitors air pressure and temperature in each tire Alerts the driver when tire pressure or temperature exceeds the set limits Rubber snap-in style valve stems for easy installation with fitment on most vehicles with 0.453 inch rim holes Proper tire inflation improves fuel economy and tire wear as well as braking and stopping distances while reducing the risk of hydroplaning