The st122hd4k 2 port 4k hdmi splitter lets you share an hdmi display or projector with two hdmi enabled audio video source devices such as computers blu ray players and cable tv set top boxes with support for ultra hd 4k the hdmi splitter ensures astonishing picture quality four times the resolution of high definition 1080p at 30 hz the 4k splitter is also backward compatible with previous hdmi revisions supporting 1080p 720p hdmi video resolution devices even if you dont require