The E-138 Tetris System is a special effects system with 16 sound-activated patterns and 18 multicolored beams per head. Each unit is linkable and features chase, sound active, flash and "all on" modes. Equipped with one master and three slaves, it also includes four 120V, 300W lamps. No duty cycle. Up to 16 units can be connected together.Plug & play operation Sound active Lamps included Linkable