The Wurth Dual Frequency Programmable Sensors are universal sensors that work with both 315MHZ and 433MHZ frequencies. The sensors replace and program old or faulty TPMS sensors with ease and are compatible with nearly all OEM TPMS systems. There are two sensors: one rubber valve snap in sensor (No. 0879024054) and one aluminum clamp in sensor (No. 0879024056). Both are used with Wurth TPMS Sensor Programming Tool (No. 087902405).