A professional passive press box (Audio Splitter) expander featuring 8 MIC outputs designed for system integrators for fixed installation. The IW stands for IN WALL as it is for flush mounting. Each Output is independent transformer balanced and isolated. It has 1 LINE input (3-pin phoenix connector). It has 1 Link output (3-pin phoenix connector) to connect more APB-P008 OW/IW in a daisy chain.