The DMX Projector SHUTTER /dowser is a small device that is used to make a true blackout in the projection area. It can be used with all types of projectors. This device is controlled via the DMX signal, USB port of a computer or using a manual switch with 3- or 5-pin DMX cable. The DMX is optically isolated and protected by transils. The device comes with mounting straps, M10 thread for C-clamp and mounting points for line securing. This product requires flaps. They are made from high-quality aluminium and there are three sizes available