Headphones & Earphones
Sennheiser HDR 120-W
Sennheiser HDR 120-W, Wireless Headphones, Additional wireless headphones for System RS 120, Circumaural, Closed design, Frequency response: 22 Hz – 19,500 Hz, Max. sound pressure level: 100 dB SPL, Operating time: approx. 20 hours
https://www.bizrate.co.uk/headphones_earphones/sennheiser-hdr-120-w-oid33547543664.html