Generator Accessories features: Diy wood hand generator building kit manual model material set Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. This product is a simple experimental model of hand generator which benefits children's intellectual development and hands-on 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. Features: Fine quality wood material is eco-friendly, non-toxic and durable. Exquisite workmanshlp provides it smooth surface. Selected top-quality 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 hand-on skill training. You turn the handle and engine begins to rotate and light the bulb. It inspires kids' creativity and imagination and cultivates their abilities like concentration, hand-eye coordination and pattern recognition. At the same time, they can learn energy transformation knowledge. Recommend age: the toy is fit for 7-14 years old kids. There is no better gift than this for children on their birthday, children's day, etc. Specifications: Name: DIY Building Hand Generator Kit; Material: Wood; Age Range: 7-14 years old; Item Size: 11*10*8cm/4.3*3.9*3.1in; Package Size: 15*15*5cm/5.9*5.9*2in; Item Weight: 145g/5.1oz; Package Weight: 150g/5.3oz; Note: -DIY 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 List: 1 * DIY Building Hand Generator Kit