Hironao Tsuboi's minimalist speaker has an equally minimal name: Vol. The speakers are simple aluminum cylinders, and their volume is adjusted by turning the edge of the speaker itself. Turning a little bit further will click this switch into the "off" position.
Vol is powered by a rechargeable lithium battery, has a jack socket for plugging in a music source, as well as a USB port and a 5V DC connection for charging.
With the actual speaker all but invisible, this might be a bad case of form beating out function, but is doesn't really matter -- Tsuboi's design is a concept, and not available in stores.
Vol Speaker [Design Boom]
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