The world's smallest wind turbines, which can automatically rotate in 360 degrees by wind. The wind power generates the two blue and one green LEDs inside to light up windmill. Fantastic for seasort decoration or daily gadget. Puff or put it near a fan, it can vividly demonstrate the principle of wind power,easily to explain kids of the environmental power concept. Wind leaves diameter: 62mm; Generator size: D18.5mm x H37mm(excluding wind tail L42mm) ; Motor shaft size: D1.5mm x L10mm; Holding pole size: D4mmL168mm Weight: about 32g (including packaging)