USB Resonance Key Speaker
This is one cool speaker that works just a little differently than the typical speaker. Instead of coming with a built-in vibrating diaphragm intended to project sound, it uses the material that it is placed on as the medium of projection.
Shaped like a keyboard button key, the speaker weighs around 200 grams and comes in a sleek black hue. You can try placing the speaker on many types of surfaces such as books, glass tables or wood and listen to the difference in quality that each material produces. $35.00, buy from USB Geek.