Great unit from ProgramSistem (PSL)! This is the Skorpion Sound Active Change Version. There are 3 versions of this unit. There is a static unit (no motion), color change version, and a sound active color change version (this one). This unit features a central 120 volt, 500 watt linear bulb that sits in the center of the unit. There is a large dish that contains large colored pieces of glass (blue, orange, green and red). The glass rotates around the bulb creating 5 large 'Fan or Blades' of light that shoot out of the front of the unit. The colors change as the glass moves around the lamp to the beat of the music. Unit is fan cooled and built very well. Made in Italy.