The GMC Chevrolet Trailer Tire Pressure Monitoring System TPMS Sensors 4T+ EAC NEW is a set of four tire pressure monitoring sensors designed for GM vehicles such as Silverado, Sierra, and Cadillac Escalade. These sensors are direct fit, easy to install. They operate on a frequency of 433 MHz and are made of plastic material. The sensors are compatible with specific vehicle models and require no programming or modification for installation. With a superseded part number for various GM vehicles, this TPMS system ensures accurate monitoring of tire pressure for improved safety and performance on the road.