The S-4 , 4 channel strobe controller is a 19" rack mountable which is capable of controlling up to 24 Mega Strobe II's, Super Strobes, S-100A's, Snap Shot's, & S-150's. It features 8 pre-programmed chase patterns, Audio Chase, Blackout, Speed, and all Flash Control. The S-4 is an ideal large strobe system controller.