... fuel economy The wireless and real-time tire pressure monitoring system TPMS system TM-505C+SI(without parking kits)TPMSIncrease safety, tire life, fuel economyThe ... wireless and real-time tire pressure monitoring system for passenger carTPMS FEATURESFull time, real time100% wireless transmittingSensor ... 433.92MHzSize(L*W*H) 85mm*40mm*51mmWeight 130g TPMS system TM-505C+SI