Pacific Dualies 80004 PressurePlus FM Series TPMS 4-Sensor Tire Pressure and Temperature Monitoring System (Trailer Kits Not Included) null null null null null 100 percent wireless and programmable system for maximum versatility Expandable up to 15 axles or 30 wheels Includes 33 preset trailer and towing configurations Accessible battery for easy replacement and maintenance Easy to install