The 4K 3x3 video wall controller supports 1-way HDMI or DVI input and 9 HDMI outputs. Its function is to divide a complete HDMI or DVI HD image signal into 9 blocks and assign them to 9 video display units (such as rear projection units, LCD TVs, etc.). It comes complete with 9 HDMI high-definition video display units to form a large dynamic image screen.
eBay