LEGO 5pc Power Functions Motor Battery IR Remote Receiver Set : Amazon.co.uk: Toys & Games
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Amazon.com: Super Motor and Remote Control Upgrade Kit for Lego Technic Porsche 911 RSR 42096 Model, 3 Motors, Power Functions Motor Set Compatible with Lego 42096 Building Block Model(Model not Included) :
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Building an off road car with LEGO Technic - Christoph Bartneck, Ph.D.
LEGO® Technic 42077 Buggy B-model Power Functions building instructions - RacingBrick