AUDIO EXTRACTION?Extract the hdmi audio signal from the HDMI input and convert it to 2 channel analog stereo output or multi-channel Audio (SPDIF) output.One HDMI Input to one HDMI Output(Pass Mode), SPDIF (Optical) audio output(2CH/5.1CH Mode), and 3.5mm stereo audio output(2CH Mode). INPUT RESOLUTION?:Up to 4K x 2K,3840x2160@ 30Hz and 4096x2160 @ 30Hz. Suitable for various HDMI source devices like Roku or Chromecast without dedicated audio output as well as Blu-ray/ DVD/ HD player, cable/satellite box, Amazon Fire TV, Apple TV, PS3/4, Xbox, PC/laptop, HD camera, HD DVR etc AUDIO EDID SETTINGS: There are Pass, 2CH and 5.1CH Three Kinds of audio mode options (Our device does not decode the audio, you will still need an end display that is compatible with those formats)