1PC USB 1M 20V 5W Mini Wind Turbine Motor Led Windmill Micro Wind Turbine Wind Turbine Science Teaching Tool Model Specification: new Model: A Without Bulb / B With Bulb (optional) Length: approx. 18cm 5 watts USB cable: approx. 1m Material: Plastic Feature: This learning toy is good for curious kids, let the children know the driving principle of the motor, how the propeller rotates to produce wind. Can be used as a wind power teaching experiment. Great to cultivate students and kids hands-on ability. Fine workmanship and good performance. Easy to use. Long service life. Package Included: (depend on your option) A: 1 x Big black paddle Wind Turbine Motor + LED colorful light-emitting diodes B: 1 x Big black paddle Wind Turbine Motor + USB cable 1m 5w bulb