Amazon.com: Optimal Shop 4X1 HDMI Multi-viewer HDMI Quad Screen Real Time Multiviewer with HDMI Seamless Switcher Function Full 1080P and 3D : Electronics
4k Hdmi 9x1 Quad Multi-viewer Hdmi Switcher 9 In 1 Out Seamless Multiviewer Switch Ir Screen Divider Converter - Channel Video Multiplexer - AliExpress
Amazon.com: Iseebiz 4K 4 in 1 Out HDMI Multi-Viewer, 4K@30Hz 2K@60Hz HDMI Screen Splitter with Sound Switch 4 Modes, Seamless Switch for Engineer, Exhibition Hall, Video Meeting, Surveillance, Display Mall etc. :
4x1 4K HDMI quad multi-viewer with 4K input and 4K output with POP PIP and KVM switch functions
4K HDMI 4×1 Quad Multi-viewer
HDMI Multiviewer Switch 4x1,AUBEAMTO Quad Seamless Switcher 4 in 1 Out with IR Remote Control, Support 4K Full HD and 5 Display Modes for Security Camera, Gaming Consoles Audio/Video Switch - Newegg.com
AV Access 4x1 4K HDMI Multiviewer, Seamless Quad-View HDMI Switch