The main material chooses the green environmental protection wood the fitting is the high quality plastic fitting the electronic fitting the safety is reliable the performance is stable. The electromagnetic swing uses the electromagnetic force and the permanent magnet to repel each other to generate the rocking power. Its principle is similar to that of the electric motor. Help children understand the difference between electromagnetic force (electromagnet) and ordinary permanent magnets and find out where to use electromagnets in their lives. Manufacturered by Angel3292. The swing is easy to assemble and the color map is assembled. Two AA batteries are required which are not included. After assembly putting the cute little man on the swing you can feel the magic of electromagnetic power. By assembling and playing the electromagnetic swing not only can you learn scientific knowledge in happiness but also exercise your child's hands-on ability improve innovative thinking cultivate their scientific awareness from a young age and lay the foundation for future mathematical and physical learning. Beautiful appearance lovely shape.