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Amazon.com: StarTech.com USB 3.0 to 4x HDMI Adapter - External Video & Graphics Card - USB Type-A to Quad HDMI Display Adapter Dongle - 1080p 60Hz - Multi Monitor USB A to
Tripp Lite B127A-4X4-BH4PH 4x4 HDMI over Cat6 Matrix Switch Kit, Switch/4x Pigtail Receivers - 4K 60 Hz, HDR, 4:4:4, PoC, 230 ft. (70.1 m), TAA - Newegg.com
USB 3.0 to 4 HDMI Adapter - Quad Monitor - USB-A Display Adapters | StarTech.com
Tripp Lite 4x4 HDMI over Cat6 Matrix Switch Kit, Switch/4x Pigtail Receivers - 4K 60 Hz, HDR, 4:4:4, PoC, 230 ft. (70.1 - B127A-4X4-BH4PH - Audio & Video Cables - CDW.com
StarTech.com USB C Multiport Adapter - USB-C to HDMI or mDP 4K 60Hz/PD/4x 10Gbps USB Hub - Mini Dock - DKT31CMDPHPD - Docking Stations & Port Replicators - CDW.com
AJA 4K HDMI to 4K 4x 3G-SDI, also supports HD-HDMI to HD SDI | BIS
1x4 HDMI Splitter - Full 3D, Ultra HD, 4K - Vivid AV® Official Site