This product is a simple experimental model of hand generator which benefits children39s intellectual development and handson ability Besides while installing and playing kids can better understand the main structure of the electric motor and know how kinetic energy changes into electrical energy It is perfect for school scientific projects or physics teaching The working principle of the product is kinetic energy is converted into motor cutting magnetic induction line motion to generate electricity transmitted to the lamp so as to achieve light bulbs FeaturesFine quality wood material is ecofriendly nontoxic and durable Exquisite workmanship provides it smooth surface Selected topquality metal components ensure the best and stable performance 11*10*8cm mini size and lightweight features enable you to store and carry it easily While assembling hand generator you will have fun with kids and they not only feel fulfilled but also get handon skill training You turn the handle and engine begins to rotate and light the bulb It inspires kids39 creativity and imagination and cultivates their abilities like concentration handeye coordination and pattern recognition At the same time they can learn energy transformation knowledge Recommend age the toy is fit for 714 years old kids There is no better gift than this for children on their birthday children39s day etc SpecificationsName DIY Building Hand Generator KitMaterial WoodAge Range 714 years oldItem Size 11*10*8cm4 3*3 9*3 1inPackage Size 15*15*5cm5 9*5 9*2inItem Weight 145g5 1ozPackage Weight 150g5 3ozNoteDIY building hand generator kit only other accessories are not included Due to manual measurement there may be deviation Due to photograph light or other reasons the item in picture and material object may have slight difference please in kind prevail Packing List1 * DIY Building Hand Generator Kit.Items from Sheng Xinshun's shop