The i24R3 Portable was unveiled at 100% Design Tokyo in 2009 as a fully sealed, waterproof extension of the i24R3 project. Rather than a single product, the Portable was conceived as a platform: a circular core speaker surrounded by a family of functional configurations suited to different user lifestyles. A sealed sound chamber houses lightweight flat panel speaker exciters and passive radiators to produce high quality sound, powered by a built-in lithium polymer rechargeable battery or AC adapter. It is both fully waterproof and wireless, available in USB or Bluetooth versions, and equally suited to indoor and outdoor use.
Further Reading
Engadget
https://www.engadget.com/2009/11/04/eops-i24r3portable-speaker-is-mad-bad-and-waterproof/
