Cyber Snipa announced today that they are now shipping the Sonar Portable Mini Speaker. This pop-up speaker is compact and features a patented vacuum bass system. It is compatible with any device that has a standard earphone jack. You can also connect multiple units together for even more sound. The built in rechargeable lithium battery lasts for 4 hours and can be recharged through a USB port. The Cyber Snipa Sonar Portable Mini Speaker is now available for the suggested retail price of $29.95.
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…which reminds me somehow of the raikko nano:
http://store.raikko.de/products/de/Mini-Aktiv-Lautsprecher/RAIKKO-Nano-Vacuum-Speaker.html
i happen to own one of these and i love it. sound is quite good for the size and – surprise – you can stack them!
The battery lasts for far beyond 4 hours by the way. rather 6 or 7 hours on full power.