4K HDMI Audio Extractor: HDMI extractor extracts audio signal from HDMI input device. HDMI to optical and 3.5mm audio adapter was developed to extract digital audio from HDMI source stereo audio output and output via optical SPDIF or RCA L/R. 3 working modes: 5.1 mode: only optical output supports 5.1 format audio. 2.0 Mode: Both fiberglass and L/R can work, but only stereo is supported in PCM format. Approval mode: Output audio format according to the EDID of the display device. With one key mode switching. High Resolution: This HDMI audio splitter supports resolutions up to 4k at 30 Hz. Supports HDMI1.4, HDCP 1.3 and monitor. Note: This product only supports up to 4k@30Hz. Wide compatibility: optical audio HDMI Splitter suitable for different devices, HDMI source, in particular Roku or Chromecast, Blu-ray/DVD/HD Player without dedicated audio output, cable/satellite TV box, Fire TV, PS3/4, Xbox, PC/laptops, high-definition cameras, high-definition hard drives, etc. Easy to use, without loss of signal. Synchronous editing of audio and video signals (note: there should be no difference in the processing time of the signal received by the screen and speakers). If any problems occur while using the product, you can always contact us and we will offer professional solutions.