The American DJ Tri Gem LED is a LED moon-flower effect. Designed for mobile DJs, clubs, bands, roller rinks and any arena that requires a compact, light weight, easy to use unit. The Tri Gem LED can operate as a stand alone sound active unit so there is no need of a controller. Since there is no power switch, the Tri Gem LED will emit light once it is plugged into a power outlet or into a power pack. Since the Tri Gem LED operates from a sound source, there is a sound sensitivity knob on the rear of the unit for adjustment.