What makes the Tunebug products interesting is that they are sound generators that turn a variety of surfaces into speakers. In fact, hold one up and you won't hear anything--it requires a reflective surface to create sounds (the company calls the technology it uses SurfaceSound).

(Image Caption: Vibe) The $70 Vibe connects to your player using a standard 1/8-inch audio jack, and comes with a Sound Base (which doubles as a carrying case) that you use to produce sound. But you can use any flat surface with it, although Tunebug suggests you'll get the best results with something such as a hollow box (on the show floor, I stuck my head inside an open-ended box for a demo, and it sounded decent--loud enough, although lacking in bass). The Vibe has a rechargeable battery that the company says will last for five hours on a charge.

(Image Caption: Shake) The Shake, which Tunebug plans to release in April for $120, builds on the Vibe concept by adding Bluetooth connectivity and touch-sensitive buttons for power and volume control. It's designed specifically for use with sport helmets for biking, skateboarding, and skiing--the Shake comes with TuneStrap and Gecko Mount harnesses--without requiring headphones that could block external sounds you might want to hear (an ambulance siren, say). Like the Vibe, it should provide five hours on a charge, and echarges from a USB port on your computer.