Drive free, suit for any operation system With on/off switch on the base Powered by USB port,Plug and play Touch the ball, the light will gather to kiss your fingertips. Plasma ball is small enough to not take up too much desktop space, and is big enough to amaze your co-workers with its awe inspiring light show A great item for decoration or a gift for friends. Add funny to your life Diameter of the ball:approx 3.5"
