Sennheiser  RS-65 Wireless RF Circumaural Headphones with SRS Surround Sound Processor (Black)
Not perfect, but works as advertised.
Overall I love these headphones, but it is important to note that they don't sound as great as the best wired headphones, but the extra freedom of movement is the entire point of these headphones. <br />It does take a bit of thought on how to get the best sound from the headphones. Basically it boils down to keeping the signal clean and sufficient volume (but not so high that it starts to distort) before it reaches the headphone transmitter (high signal to noise ratios). Don't give a quiet signal and expect battery powered headphones to amplify it to high volumes without adding noise.<br />Then, make use of the frequency selection. I haven't heard much static at all after finding a clear signal.