Amazon.com: MT-VIKI Video Wall Controller 3x3, Support 1080p 60Hz HDMI Output and 1 Input for 9 TV Splicing Display, 9 Channel Video Wall Processor : Industrial & Scientific
Brightlink's New 4K UHD 3x3 Video Wall Controller - 1 input to 9 Displ
4K 3x3 HDMI Art TV Video Wall Controller Processor Multi-screen Display HDMI Video Art Stitching Wall splicer Splicing For PC TV - AliExpress
3x3 4k Hdmi Usb Video Wall Controller Player Processor Switch Hdtv /usb Source Out Ir/rs232 Control For Radio & Tv Broadcasting - Radio & Tv Broadcasting Equipment - AliExpress