BSODIAL(TM) USB Powered Plasma Ball ReviewbP PP SODIAL(TM) USB Powered Plasma Ball PTouch it with your hand and the light beams follow your fingersPGreat color effect. Perfect item for car or home decorationPStick it at anywhere inside your car to create a special interior lighting environmentPUSB Powered Only, AC with use of adapter (Not included), Not battery operatedPBulb Diameter: Approx 3 inch.