Hopkins 30100VA nVISION Tire Pressure Monitoring System Monitors tire pressure and temperature while working on small trailer tires, car tires, truck tires, or large RV tires between 10 and 200 PSI Monitors the vehicle you are driving, your towed vehicle or trailer, and any spare tires, and can monitor up to 24 tires simultaneously Unique 4 position memory lets you program different vehicles or trailers into memory at the touch of button Quick-Set Installation Cord allows the monitor to become portable to take with you to each tire during installation Includes one monitor with non-skid pad, one power cord, quick-set installation cord, and four tire sensors