Panasonic RP-WF6000 Cordless Headphones with Surround Technology (Discontinued by Manufacturer) 2.4GHz digital wireless surround headphones Transmission range up to 98.7 feet Built-in rechargeable system 2x optical digital input Ready for Dolby Pro Logic II, DTS, Dolby Digital surround EX, DTS-ES, MPG-2 AAC formats