Sennheiser HDR 165 Extra headset for RS165 wireless headphone system at Crutchfield
Sennheiser HDR 120 Extra headset for RS 135-9 wireless headphone system at Crutchfield
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 - Walmart.com
Amazon.com: Sennheiser Consumer Audio HDR 175 Accessory RF Wireless Headphone for RS 175 System : Electronics
Sennheiser HDR 65 Headphones with T60 Base Wireless and charger | eBay
Customer Reviews: Sennheiser HD 65 TV TV headphones with in-line volume control at Crutchfield