We built the first bot (bot for drawing) and it worked only two times. We didn't even finish the second bot we tried (a balancing car robot) because when we tested the engine, we immediately noticed a burning smell. The negative end of the battery compartment was slightly broken. Not quite sure how safe this product is, can't recommend. This was pre-purchased and given as a Christmas present but Revain will not allow us to return it. Let's hope the manufacturer fixes that. Take care!
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