Attributes . Radio Shack - 33-122, Sony - MDR-RF925RK, Sony - FS-251, Sony - MDR-RF4000, Sony - MDR-RF4000K, Sony - MDR-RF810, Sony - MDR-RF810RK, Sony - MDR-RF840, Sony - MDR-RF840RK, Sony - MDR-RF850, Sony - MDR-RF850RK, Sony - MDR-RF860, Sony - MDR-RF860RK, Sony - MDR-RF925, Sony - MDR-RF970, Sony - MDR-RF970RK, Sony - MDR-IF245RK . Names