User manual Sennheiser RS 120 Wireless Stereo Headphone System RS120II | PDF-MANUALS.com
Amazon.com: Sennheiser RS 120-W On-Ear Wireless Headphones for Crystal-Clear TV Listening with 3 Sound Modes, Lightweight Design, Easy Volume Control, 60 m Range and Convenient Transmitter/Charger Combo - Black : Electronics
Sennheiser HDR 120 Supplementary Wireless Headphones For RS110, RS120, + Systems | eBay
User manual Sennheiser RS 127 (English - 36 pages)