What a fascinating thing to see the mechanical miracle coming to life by your own hands. Its so amazing to see the mechanical self propelled moving. Make people back to Mechanical age and let kids know more about the Mechanical and science. High quality model kits which need your more patience to assemble it. But the English detailed instruction with fairly easy picture will help you a lot. And no battery or other power need self propelled but you need to use a little wax and the tool provided to make it move smoothly. Manufacturered by . kit is wonderfully designed the parts are well-cut and it does work well when put together but it is somewhat challenging to put together. Do not rush and force anything. Be patient and focus when assembling this items. It will exercise your patience and attention. And you could paint it after completed as you like. A great project for a family. This Mechanical series is a unique and creative gift for your boyfriend husband father your son or grandson who is a model builder or puzzle lover. It looks so cool and creates a decent challenge for an adult. Best choice for someone who enjoys craft-based hobbies. Unique 3D Puzzle Laser-cut ply material no tonic environmental friendly smooth board. All pieces are pre-cut no glue needed perfect as desk model or home decoration.