I found this while I was looking through the Wal-mart website.

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Turtle Beach Ear Force W3 – designed specifically for your active movements while playing Nintendo’s new flagship console, the Wii.

The W3’s comfortable padding and behind the neck ergonomic design guarantee that they’ll stay in place during the most active Wii Gaming sessions.Key Features

  • AC-powered transmitter connects to Wii audio output.
  • Splitter cable lets you keep your TV audio connected.
  • Battery and instruction manual included.

Link