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This is an HDMI extender that transmits HDMI audio and video long distances over CAT-6 ethernet cable. The feature I like is support for Audio Return Channel (ARC), which means a TV can treat a stereo that's connected to it as an external speaker...so anything plugged directly into the TV can be listened to through a home stereo system. Good for a smart tv where you watch content directly on the tv that wouldn't connect through a stereo receiver.