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The Logitech(r) mm50 iPod(r) Speaker System utilizes 3-in pressure drivers to maximize bass and minimize distortion. The rechargeable Li-ion batteries last up to 10 hours, and you can charge both the speaker system and iPod(r) battery simultaneously. Using 3-D sound processing that "widens" the stereo effect, this system's sound seems to come from an area about 2 feet wider than the speaker itself.