Compatible with the following Sony battery models:

Sony BP-HP550-1 BPHP5501

Sony BP-HP550-11 BPHP55011

Compatible with the following Sony headphone models:

Sony MDR-IF245RK MDRIF245RK

Sony MDR-RF4000 MDRRF4000

Sony MDR-RF4000K MDRRF4000K

Sony MDR-RF4000RK MDRRF4000RK

Sony MDR-RF4000-1 MDRRF40001

Sony MDR-RF810 MDRRF810

Sony MDR-RF810RK MDRRF810RK

Sony MDR-RF840 MDRRF840

Sony MDR-RF840RK MDRRF840RK

Sony MDR-RF840RJ MDRRF840RJ

Sony MDR-RF850 MDRRF850

Sony MDR-RF850RK MDRRF850RK

Sony MDR-RF860 MDRRF860

Sony MDR-RF860RK MDRRF860RK

Sony MDR-RF925 MDRRF925

Sony MDR-RF925RK MDRRF925RK

Sony MDR-RF970 MDRRF970

Sony MDR-RF970RK MDRRF970RK