This is the All New Selectable switch for the Nova Superpak 606X and Xpak 604X Extreme Strobe power supplies.    Allows you to choose which strobes are running as well as the flash pattern.    All of these features will be at your fingertips.    With it's complete harness and simple 1 plug installation there will be no more figuring what wire goes where.    This switch is complete and ready to install.