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Amazon.com: SENNHEISER 506488 Male 2.5mm to Female 3.5mm 1/8" Audio Adapter Plug (Adapt Audio/Mic to DECT Phone) : Electronics
Sennheiser Adapter 6,3S - 3,5S - - Adapter jack 6.3S - jack socket 3.5S
Sennheiser H-82370 - 1/4" Stereo Phone Screw On Adapter 543684
Amazon.com: 2.5mm Male to 3.5mm Female Audio Adapter Earphone Converter , 2.5mm to 3.5mm Headphone Adapter, for Technica ATH M40X ATH M50X, for Sennheiser HD518 HD558, etc : Electronics
Amazon.com: Replacement Cable for SENNHEISER Headphones HD650 HD600 HD580 HD535 HD545 HD565 HD265 with 1/4" 6.3mm plug : Electronics
AC Adapter DC Power Supply Cord Charger For Sennheiser RS 135 Wireless Headphone | eBay
Headphone Adapter Replacement Spring Coil Cable Cord For Sennheiser Hd 25-sp Hd 222 Hd 224 Hd 230 Hd 250 Hd 250 Linear Ii Hd 414 - Protective Sleeve - AliExpress
Sennheiser HD 25/HD 25 SP Headphone Adaptor Mini Jack To Jack Connector Plug | Reverb