Scientifics Direct Asterism Battery Operated Hypnotic Pendulum Display COOL DESK DECORATION - A great way to create a conversation piece at your desk is with the Asterism Hypnotic Pendulum Display. Set this up and just add a 9-volt battery and the electromagnet in the base will set this device into perpetual motion. CONTINUOUS MOVEMENT - When the magnet in the large ball swings down, it flips a transistor switch turning on the electromagnet. The electromagnet then repels the magnet. It swings up again, breaking the current and turns off the electromagnet and setting the small globes into revolution. SCIENCE IN MOTION - This battery-operated kinetic sculptor demonstrates the principles of attraction and repulsion. Fun for any kids that want to learn more about physics or science in general. MESMERIZING TO STARE AT  Take a break from a stressful day and indulge in the mesmerizing pendulum as it swings back and forth while the three asterisms spin and twirl through the air. The chrome of the plastic pendulum gives the Asterism the appearance of cold steel making this piece a visual spectacle. SOPHISTICATED ATMOSPHERE - The ambiguity of this piece allows its placement to be versatile. Place this in an office, in a waiting room, display windows, and foyers and let this device change the mood, entertaining wherever it goes. The main pendulum measures 11.5&#034;H x 8&#034;W Base measures 4&#034;W x 1.5&#034;H Chrome colored plastic pendulum Requires a 9V battery For ages 14+