The X-Mini Capsule is the world's first pocketsized speaker with built in bass support and it's own rechargable battery. It is small in size but it more than makes up for it's stature with uncompromising sound quality and volume.
The Secret: Vacuum Bass - Pioneering their patented technology, the X-Mini can be extended upwards like an accordian. It is this expandible vacuum which mimics the resonance characteristics of a subwoofer, giving the Capsule a crisp, full bodied sound and volume. The vacuum, can be extended during playback and closed for compact storage.
Everyday Speaker For Every Occasion: The X-Mini is one of the smallest speakers in the world with justifiable sound quality for daily portible useage. The integrated rechargable batteries offer up to 8 hours of contstant playback from a full charge. Due to it's portability and high quality sound output the Capsule is the ideal accessory for an ever growing range of portable electronic devices; Mp3 players, laptops, multimedia players,mobile phones, portable games consoles.
Short review here: http://www.kk.org/cooltools/archives/003709.php