The Plasma Mug produces a unique lighting effect via "advanced plasma technology", impress and amaze your friends. The Plasma Mug works with hot or cold beverages. Utilizing advanced Plasma technology, the double-walled, hand-blown glass mug works in conjunction with the specially designed electronic coaster to create this one-of-a-kind lighting effect! Just place the Plasma Mug™ on it's coaster and watch the magic appear! Watch in amazement as the plasma light responds to your every touch!