The HDMI matrix 2x4 can connect 2 HD signal sources to 4 HD display terminals. It allows 2 HDMI devices to be switched or split easily to 4 HDMI compatible monitors or projectors. So any of the 4 outputs can display either of the 2 inputs. Any output port can realize independent audio output by optical fibre or stereo headphone . The audio can only be separated from the input of HDMI out 1. * Supports 4k input resolution 2k output (down scaler ) *Supports 2 HDMI audio outputs, 3.5mm earphone jack and optical output at same time.