Wireless RF Headphones with Charging Dock

I bought this a few months ago for more than $80. It has been used slightly.

https://www.amazon.com/Sennheiser-RS120-Wireless-Headphones-Charging/dp/B0001FTVEK/ref=sr_1_4?ie=UTF8&qid=1515806955&sr=8-4&keywords=wireless+sennheiser+headphones

Includes wireless headphones, wireless transmitter that acts as the headphone charging dock and two AAA NiMH rechargeable batteries.Connectivity Technology: Wireless
Lightweight radio frequency (RF) wireless, on-ear headphones for use with TV and Hi-Fi Audio
Interference-free reception through walls, ceilings and outdoors up to 300 feet
Can be connected with additional compatible headphones (sold separately) for mutiple users
2-year limited warranty only when purchased from an authorized dealer. Compatible with set-top DVD & Blu-Ray players, DVR's, satellite receivers, a/v receivers, laptops, mac/PC, MP3 players, LCD, Plasma and standard televisions that feature RCA outputs (red and white outputs) and/or 1/8" and 1/4" headphone sockets
Not compatible with Bluetooth technology. Please Note: Kindly refer the Instructional Video and the User manual before use which is highly essential.
Extends The Range Of Any Remote To Control A/V Devices Through Obstacles From Up To 120 Ft Away