Taking aim at the low-end and middle market, Motorola has shipped three ROKR handsets, the EM30, EM28 and EM25, the company said. At the top of the line is the EM30, which carries a candy-bar design with technology that flashes different colors to help users change modes with a single click, while the clamshell EM28's front display houses a touch-sensitive key for media control. The EM25 is aimed at music lovers.

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