Description: This perpetual motion meter is a type that transforms through the direct current input and transforms into the magnetism, uses the positive and negative energy conversion function of the battery, can cause it to swing automatically. Features: It is a decorative ornament, and it can also be used as a tool for physics explanation for elementary school students.. The perpetual motion is a piece of revolving art for your desk. This sculpture has a ball or dolphin is surrounding by the ring that rotate like a ferris wheel. It will keep you and anybody else who watches it mesmerized for hours. Great for home ornament, study or office desk table decor accessories, etc. Also good for birthday gift and kid toy. Specification: Condition: 100% brand new Material: Plastic + Wrought Iron Color: Sliver Type: A603 / A607 (Optional) Size: 11 x 24.5 cm / 4.33 x 9.65 inch(appr.) Package Included: 1 x Electric Wiggler Swing ball Note: 1. Please allow 1-2 cm error due to manual measurement and make sure you do not mind before ordering. 2. Please understand that colors may exist chromatic aberration as the different placement of pictures..