4K Support & Advanced Features: This HDMI Splitter supports 4K@30Hz output and is backward compatible with 1080p, 1080i, 720p/720i, 576p/576i, and 480p/480i. Use HDMI 2.0+ cables for full 4K. Key Limitations to Note: 4K HDMI Splitter not an extend mode device, not a switcher (can't connect 4 inputs to 1 monitor), not an audio extractor (can't connect to speakers/soundbars), doesn't support ARC, and doesn't support mixed resolutions.