Wind Power This kit includes 2 styles of windmill blades and a gear box with 3 different gear ratios to fit all wind conditions. The windmill blades are adjus- table by angle and quantity to make best use of wind in order to make the LED shine bright and charge the battery as fast as possible. The kit helps children to explore the power of wind and stored energy to activate the models they build up. Includes a 40 page coloured manual with illustrations of 2 windmills, 6 model vehicles and various experiments.