Sennheiser HDR 120 Accessory RF Wireless Headphone for RS 120 System Price: $193.99 (as of 25/02/2021 22:07 PST- Details)

Sennheiser HDR 120 Headphones, Extra Wireless Headphones for RS110 and 120 Systems (charger not included)
Open, stereo, supraaural, wireless RF headphone.
Detailed, analytical sound reproduction with strong bass response. Suitable for all types of modern music and TV applications.