6 in 1 Educational Solar Kit - Robotikits
No batteries or screws needed - just snap the pieces together and wire in the solar panel and gear box to see just how much power the sun can supply! Models that can be built are: windmill, tethered revolving plane, airboat, plane, car, and puppy. Simple but very effective. The only tool needed in the diagonal cutter for removing the plastic components from the mold tree.