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