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Nanobot: Icarus is a tiny Lego® compatible robot that is built to fit in the palm of your hand, all at a $19.99 price point. Being the smaller version of Atlas, it retains the same forum and functionality all at a smaller standpoint.
These robots are a great introduction into teaching kids servo rotation and the arduino ide
Icarus includes everything needed to get up and running
Two 180 degree servos
Body frame and arm connectors