Exell Battery Fits Sony Headset BP-HP550-11, BP-HP550-2, Replaces Sony MDR-RF860, MDR-RF4000, MDR-RF970, MDR-RF970RK, MDR-RF925, MDR-RF925RK, MDR-RF4000K, MDR-RF860RK, MDR-RF850, MDR-RF850RK, MDR-RF840, MDR-RF840RK, MDR-RF810
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