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This 4 in 2 Out HDMI matrix switch combines switching, splitting and audio extraction all in one unit. It allows you to freely assign four HDMI signal sources to two displays in any combination, ideal for multi-screen setups. Integrated Optical and L/R audio ports let you extract audio independently without affecting video output, perfect for connecting external audio systems. It supports 4K, 1080P and 3D content, while EDID function ensures stable resolution and smooth audiovisual synchronization. Comes with IR remote for convenient operation, plug and play without complicated drivers. Great for home theater, conference rooms, office presentation and commercial multi-display video distribution.