Motorcraft 8C2Z-1A203-A Tire Pressure Monitor Sensor (TPMS) activation/programming tool for use on 2007 and newer Ford vehicles after rotating tires, purchasing new TPMS sensors or using different wheel rims equipped with Ford or Ford-compliant TPMS sensors. This tool makes it easy to calibrate the tire sensors to your vehicle’s computer (and get rid of that annoying TPMS light on your instrument panel). This unit sells for ~$50. I will sell mine for $20 firm.
Google this item for additional information, including instructions on how to use this tool and specific vehicle applications