Description This is a perpetual movement model. The force is applied by the force of the hand and then the energy converted by the battery continues to swing until the battery is running out. It can be a fashion desktop ornament for home or office use. It is a nice science art gift, we can send it to our friends, children, family. Features - Color: Silver, black. - Material: Plastic, iron, magnet. - Size: 22.60X14.50X24.00cm/8.88X5.70X9.43inch. - Powered by: 4 x AA batteries (Not included). - Rigorous process, selected good material manufacturing, seemingly simple, but everywhere is delicate. - Great for those enthusiastic about science or to demonstrate the laws of physics in science classrooms. - Can be a good ornament for your home. Give you a different feel and happy mood. - It can be a good photo prop for you to take some unforgettable pics with friends. - It is a nice science art gift, we can send it to our friends, children, family.Package list: 1 x Adornment (Without Battery)