Touch it with your hand and the light beams follow your fingers Great color effect. Perfect item for car or home decoration Stick it at anywhere inside your car to create a special interior lighting environment USB Powered Only, AC with use of adapter (Not included), Not battery operated Bulb Diameter: Approx 3 inch. On and Off switch This mini plasma light sphere creates a dramatic display of light inside a hand-blown glass sphere. Just place your fingers on the glass surface and watch as colored bolts of glowing light follow your every move! This item is 100% Brand New. Never used. Package contents 1 x Plasma light 1 x USB cable