Works with for Sennheiser HD 25-sp,HD 222,HD 224,HD 230,HD 250, HD 250 Linear II, HD 414,HD 414 SL,HD 420, HD 420 SL, HD 425, HD 430, HD 440 II, HD 442 II, HD 450 II, HD 480 Classic, HD 480 CL-II, HD 480 II, HD 490 II, HD 520, HD 520 II, HD 530, HD 530 II,HD 540, HD 540 II, HD 560, HD 560 II Earphones.
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