Description: DIY assembled hand generator bulb toy model kits set，educational science physical DIY energy conversion experiments toy Energy conversion principle : mechanical energy - electrical energy - light energy Electric current can be generated by shaking the handle , and the bulb will shine Including parallel or series circuit， physical and energy conversion principle tips for kid child learning studying Develop children's hand & eye coordination, and help children experience the theory of power, expand kids scientific & mechanical interest Great scientific experiments lab teaching aids school supplies，Cool designed DIY scientific toy gifts for kids Main Material: Plastic Color：Multicolored Specification: Need to be assembled by yourself: assemble the model as the pictures shown Size Chart: Assembled size (L*W*H): Approx 12*10*5cm/ 4.72*3.93*1.96 inch Package Includes: 1 Set DIY Hand Generator Bulb Toy (with assembled picture instructions) Note: Due to the manual measurement, please allow 1-2mm differences in size Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand