Dynaflex Powerball: Spinning in the Hand
\n\tBy rotating your wrist or moving your forearm back and forth, yourcan increase the Powerball’s rotational speed. The faster it goes, the brighter the LED. Also, the built-in Speed Meter will track RPMs.
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\n\tFor more details, read my Geek Gifts 2012 review of the DFX Powerball Gamer Gyroscope.
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\n\tPhoto of Dynaflex Powerball by Wally Bahny for TechRepublic