The WoWee One is a portable and rechargeable speaker for the iPad and other devices including iPods, iPhones, laptops, netbooks, mobile phones and MP3 players. The speaker provides high range fidelity for crisp and sound projection and has patented Gel Audio technology. The speaker lasts up to 20 hours when charged once.
It features a mini USB port for charging or powering the unit when connected to a standard powered USB port and can turn any object or surface into an on the fly sub woofer. The speakers costs 79.99 dollars. [link]