4K HDMI Matrix 4 In 4 Out HDMI Switch Splitter 4x4 RS232 Software IR Control 4K@30Hz 3840*2160P HDMI Splitter for CCTV Monitor
Amazon.com: KVM Switch with Serial Port Control, 4K@60Hz 4 in 1 Out HDMI KVM Switcher Box for Share Mouse Keyboard and Monitor, Can Work with Pi-kvm, Compatible with Windows/Linux/Mac System : Electronics
HDMI2.0 Switch 3 ports 4K UHD 3D, RS232, Remote Control - Switch, Splitter Audio Video - Home Cinema
HDMI switch and multi-viewer switcher. Should I buy a more functional device right away? | by teardownit 🛠️ 🔬 ✍️ | Medium
4x1 Switcher for HDMI with RS232 | Gefen
Vivolink HDMI 2.0 switch (3 in - 1 out)
Amazon.com: TESmart 8X1 HDMI KVM Switch 8 Port Enterprise Grade Support 4K@60Hz Ultra HD | RS232 | LAN Port | IP Control | Auto Scan | Rackmount [Control up to 8 PCs
Amazon.com: MT-VIKI Rack Mount HDMI Switch, 8 Ports HDMI Switch 8 in 1 Out 4K@60Hz (4:4:4) HDCP2.2 + Rackmount-Ears+RS232 +Auto Swtich, Auto Scan (8x1) : Electronics
Amazon.com: TESmart 8x8 HDMI Matrix 4K Matrix Switcher Support EDID, 4K@30HZ, 1080P 3D, HDCP, 8 in 8 Out HDMI Switch with IR Remote Control, RS232, TCP/IP Control, Rack-Mount HDMI Matrix : Electronics