Brightlink 4k 4x4 Seamless Matrix with 2x2 Video Wall Controller | Brightlink AV
Amazon.com: Tripp Lite 4x4 HDMI Over Cat5 / Cat6 Matrix Splitter Switch , Transmitter for Video and Audio, 1920x1200 1080p at 60Hz(B126-4X4) , Black : Electronics
4x4 4K HDMI Matrix Switch Video Wall and Seamless Switching – TESmart