Amazon.com: Sennheiser Polycom Adapter Cable for Electronic Hook Switch for Soundpoint IP 430 and Above : Electronics
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6.35mm Replacement Cable for Sennheiser HD25 HD560 HD540 HD480 HD430 414 HD250 HD 425 HD 430 HD 440 II HD 530 Headphone 3.5mm - AliExpress Consumer Electronics
Replacement Cable for Sennheiser HD25 HD560 HD540 HD480 HD430 414 HD250 HD 425 HD 430 HD 440 II HD 530 HD 540 Headphone Audio|Earphone Accessories| - AliExpress