Maintain strict separation between connected systems without slowing operators down. The Black Box SECURE KVM SH 4PORT HDMI USB CAC is designed for secure workstation environments where access control, source isolation, and dependable switching are non-negotiable. With support for four HDMI-connected systems, it gives users a clean way to move between classified or sensitive endpoints while preserving the security posture required in regulated spaces. CAC support adds a critical layer of authenticated access for government, defense, and other high-security deployments. USB connectivity supports common peripherals at the desk, reducing the need for extra hardware while keeping the operator experience straightforward. This is the kind of KVM chosen when a lower-cost switch is not enough—because the real requirement is not just connectivity, but controlled access and trusted handling of multiple systems from a single console. For secure operations centers, command desks, and environments with strict compliance requirements, this model helps reduce clutter, simplify operator workflows, and preserve the integrity of each connected source. It is built for teams that need confidence at the console every day, not just basic switching.