8cm diameter plasma ball sphere control by toggle switch; When you touch the ball the lightning bolts will combine into a strong beam and follow the movement of your finger very fantastic. Method use USB cable to connect the ball to external device and turn on toggle switch can light up the ball. With 4 USB ports convenient to use. Auto switch speed provide optimum transfer rate. Backward compatible with USB 2.0 FULL/ USB 1.1 / 1.0 can connect kinds of high speed (480/12Mbps) and low (1.5Mbps) external USB devices. With over-load voltage protection instantaneous current overload protection. Perfect as desk decoration and great gift to your friends.