The Magic Box DMX 8>4 A/B Switch uses a manual switch to change the DMX source between two 2048 channel lighting consoles e.g. master & back-up. The cost effective unit is unpowered & doesn't incorporate any electronics or software, so is unlikely to let you down when it counts most! The unique Magic Box interlocking enclosure facilitates rack mounting when used in pairs & truss mounting via captive nut insert.