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This HD-MI switch 4x1 with audio extractor allows up to 4 HD-MI input source and 1 HD-MI Output display, helps reduce the clutter of HD-MI wires being fed into your HDTV. Simultaneously, Via optical/3.5mm port add external speakers, amplifiers, soundbars to your film/game system with ease.(Tips: SPDIF and AUX audio support output separeately to soundbar, amplifier, headphone and other audio receiver without connecting TV / Monitor)