Meet GoBrix R/C Building Brick Motors: a useful kit that lets you motorize your brick creations. It is compatible with LEGO, Mega Bloks, KRE-O, and K’NEX Bricks. The starter set includes 2 motors, wheels, axles, and remotes. You can add an additional motor and other parts to do even more.
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GoBrix R/C Building Brick Motors from ThinkGeek
GoBrix lets you bring your LEGO creations to life without programming. Just snap a motor and wheels on, and you will be able to control your build with a remote. You can get one of these for as low as $19.99.
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