A perennial favourite - what little boy could resist! A self-contained building brick model to make.

• When the sun shines, the rotor spins.
• Rotor (but not bricks) compatible with major construction toys including Lego, K'nex, Fischer Technik, Best-lock, Tyco, Eitech and most metal construction sets.
• Excellent for demonstrating solar power in action – put your hand over the panel and the rotors stop turning.
• 12 cm long.
• Not suitable for under 3s due to small parts.