HiFi-Stereo-Kopfhörer HD 110 Speaker-P Sennheiser Electronic Labor W; | Radiomuseum
Sennheiser RS 110 Over-Ear Headphones, Open Cup, Volume Control with 6.3 mm (1/4") Stereo Adapter, AC Power Adapter, Transmitter Unit, 2 AAA batteries, Black, Silver, 009917 - Walmart.com
Sennheiser RS 110 II On-Ear Headphone (Black) : Amazon.in: Electronics
Sennheiser RS110 Mod | Headphone Reviews and Discussion - Head-Fi.org