Part Number: CP-SP73Type: Li-IonVoltage: 3.7VCapacity:1200mAhReplaces:SP70ACompatible with SonyPHA-1, PHA-1A, MDR-1ABT, MDR-1ADAC, MDR-1RNC, MDR-1RNCMK2, MDR-1000X, WH-1000XM2 , MHS-TS55