The 4x2 Matrix can connect four HD Source with two HD Display, which can also do extra audio output by the SPDIF port or Headphone port. It can switch or distribute the four HD Source to the two HD Display easily. The matrix also can support ARC function, which can upstream the TV audio to the amplifier. One HDMI Input support MHL/HDMI double mode input, the other three HDMI input support only HDMI single mode input. The output A support extra audio output by SPDIF port and 3.5mm Headphone Port. HDMI to achieve the synchronization of audio signal separation. There are AUDIO PATH/ 2.0CH / 5.1CH three kinds of audio mode options Support Full HD 1080P, Full 3D Support 4K*2K resolution