Item Type: Electronic Perpetual Motion Desk Toy Material: Plastic, Metal Combined Product Size:Approx. 16.5 x 11 x 19cm / 6.5 x 4.3 x 7.5in Battery: Base:4 x AA(Shipped Without Battery) Package List 1 x Base 2 x Install Pendant 1 x Metal Ornaments Shipping without batteries. 1Multi Purpose: Perpetual motion desk toy is widely used in advertising display, children's learning and education, home, office, desktop decoration,birthday gifts, Christmas gifts, etc. 2Strong Practicality:Perpetual motion desk toy can help keep your concentration, relieve stress, or just relax during working hours or brainstorming sessions. 3Easy Installation: Electronic perpetual motion desk toy is easy to install and disassemble without complicated procedures, and even people who have never touched it can easily install the model. 4Exquisite Gifts: Perpetual motion machine toy can be given to family, friends and colleagues as holiday gifts or birthday gifts, and they will love it. 5Magnetic System: Perpetual motion device toys is controlled by magnetic system, which makes it swing and full of the sense of future technology.