Brand: Sony Part No: 1-756-316-21, 1-756-316-22, BP-HP550, BP-HP550-2 Fit Model: BF-TDSY, MDR-DS3000, MDR-DS4000, MDR-IF140, MDR-IF140K, MDR-IF240R, MDR-IF240R?K, MDR-IF240RK, MDR-IF3000, MDR-IF540R, MDR-IF540RK, MDR-RF800R, MDR-RF800RK, MDR-RF820, MDR-RF820R, MDR-RF820R?K, MDR-RF850R, MDR-RF850R?K, MDR-RF885R, MDR-RF885RK, MDR-RF920RK, MDR-RF925RK, MDR-RF960R, MDR-RF960RK Volts:1.2 Type:Ni-MH Capacity: 700mAh / 0.84Wh Color: Black; Dimension:46.05 x 11.30 x 11.30mm; GrossWeight: 36 NetWeight: 11.0