Features: 1.This kinetic art asteroid supports both USB cable power supply and 4 AA batteries power supply. 2.An excellent model displaying the planetary motion, leacing an impressive understanding about astrophysics. 3.Accurate imitation makes children curious about new things to arouse strong interest, an ideal teaching tool. 4.Also a perfect decoration for various places, including home, office, classroom, library and so on. 5.Adopting high quality plastic and steel balls, the art asteroid toy is very durbals for long-term use. specification:Item Type: Kinetic Art Asteroid Product Material: Iron + Plastic Product Size: Approx. 21.8 x 10.5 x 24cm / 8.6 x 4.1 x 9.4in (There might be small errors in manual measurement) Application: Suitable for gifts, desk decorations, etc. Battery: 4 AA Batteries (delivered without batteries) PackageList: 1 x Base 2 x Bracket 2 x Half Circle Coil 1 xAxesBall 1 x Round Frame 1 x USB Cable