Specification: Kids will learn from the mechanics of the hand-crank generator and how the energy is used to generate electricity, physics experiment equipment. Through this DIY building toy, kids can construct their very own powered mini fan that uses a hand crank gyrating motion to making the fan turn. The best gift choice for your child as Christmas gifts, children's day gifts, birthday presents. Type: DIY Generator Material: Electronic Components, Plastic Size Details: Hand Crank Generator: 8cm x 7.5cm/3.14" x 2.95" (Approx.) WireLength: 26cm/10.23" (Approx.) Lamp Holder: 7.5cm x 3.5cm/2.36" x 1.37" (Approx.) Lamp: 2.3cm x 1cm/0.90" x 0.39" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Hand Crank Generator 2 x Wires 1x Lamp 1 x Lamp Holder