Compatibility Warning: Use only the included USB4 20 Gbps cables. Do not use Thunderbolt 3/4/5 cables. The switch works with USB4 and Thunderbolt 4 docks, but its 20 Gbps bandwidth (vs. 40 Gbps for most docks) may reduce display stability or limit resolution/refresh rate compared to a direct connection. Power Delivery depends on the connected dock/monitor design. macOS only supports one external display. Avoid USB-C docks with built-in pigtail / captive cables to prevent compatibility issues. Ultra-Fast 20 Gbps USB4 / USB C Switcher for 3 Computers: Share a USB-C or Thunderbolt 4 monitor or docking station between three computers with this USB C KVM switch. Connect the pigtail cable to your monitor or docking station and the included USB-C/USB4 cables to each computer for seamless sharing. Achieve data transfer speeds up to 20 Gbps, perfect for large file transfers, video streaming, and demanding applications.