Build this amazing wind generator and learn about renewable energy. Watch the LED glow as it is powered by free energy from the wind. No batteries required! Contain 1 rotor, 1 front-housing with gear and rotor shaft installed, 1 back housing, 1 tail, 2 half screw caps, 1 toy motor with gear (generator), 1 motor cover, 8 small screws, 1 LED with wires and detailed instructions. Also required, but not included in the kit: a small crosshead screwdriver and a clean soda bottle. The diameter of the assembled rotor is 14cm The kit includes: 1 rotor, 1 front housing, 1 toy motor with gear, and detailed instruction.