Sennheiser - Spare - headphones - full size - wireless - for RS 110, 120 - Walmart.com
User manual Sennheiser RS 110 II (English - 32 pages)
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 Wireless Stereo Headphones for sale online | eBay