Soundbug: Use your windows as speakers

"This British-designed innovation is about the size of a computer mouse and turns any hard surface into a speaker. Plug it into your music device, stick the sucker to a door, window or desk, hit play and prepare to be amazed when your surface of choice starts singing back at you. If you stick it to a window or door and then go outside the sound is equally as good on the other side. Its not going to burst your eardrums or throw out a dirty pumping bass, but considering its diminutive size it?s certainly enough to keep you entertained if you?re on the move. Ideal for the nomad who likes to travel light - stick it to your hotel room mirror, window or closet door to enjoy your tunes.

Now for the scientific part - the main component of the Soundbug is a tiny piece of a material called Terfenol-D, which was originally used by the US Navy for sonar work. The Terfenol is placed within an aluminum case and a coil is wrapped around it. When electricity passes through the coil the Terfenol expands slightly creating a massive force of 400 pounds - when it?s attached to a flat surface it transmits electronic signals into mechanical energy causing the flat surface to vibrate and broadcast the sound.
If that's not enough to whet your appetite it?s even got a cool energy-saving feature which turns it off whenever the music stops so it won't chew up your batteries."
- Firebox

- Requires 3 x AAA batteries (not supplied).
- Batteries should last up to 4 hours.
- Features three-position switch: Off, Soft and Loud.
- 75db output (depending on surface).
- Connect 2 Soundbugs together for stereo sound and double the impact.
- Dimensions 3¾" (L) x 2" (W) x 1½" (D). Weighs less than 7 ounces (including batteries).
- Can be used with any sound device that uses a 3.5mm jack (MP3 player, CD player, Walkman, PC, Laptop etc)