The Tunebug Shake mounts onto any standard helmet and turns it into a surround-sound system -- without sacrificing ambient noise. Connect an iPod or other digital noisemaker by wire or Bluetooth and the Shake vibrates the helmet so the helmet itself is the speaker.
Tunebug previously released another product, the Vibe ($69.95), that turns a desktop or tabletop into a speaker, and will launch the bigger and better Quake, featuring a built-in microphone for use with cell phones, in the near future.
The Tunebug Shake will be available next month (April 2010) for $119.95. You can pre-order it now at www.tunebug.com.