Note: This splitter not support dual-screen extension. Due to HDMI standards, it only mirrors one signal to two displays simultaneously. 4K Ultra HD Resolution: Powered HDMI Splitter support 4K@30Hz, Backward compatible with 1080p@50/60Hz/1080i@50/60Hz/720p@50/60Hz/720i@50/60Hz/576p@50Hz/576i@50Hz/480p@60Hz/ use HDMI AWG 26 cable, for 4K,length≤16ft; for 1080P,length≤.