Keep sensitive systems under disciplined control with a secure KVM switch built for environments where access, visibility, and isolation all matter. The Black Box KVS4-2004VX supports up to 4 computers and is designed to centralize keyboard, video, and mouse operation while helping prevent unauthorized data movement across connected systems. With DisplayPort support and 4K graphics mode, it is suited to operators who need sharp visual detail for monitoring, analysis, and command workflows. CAC support adds another layer of access control for deployments that require credential-based authentication at the workstation. This is the kind of KVM selected when standard switching is not enough. Mechanical, electrical, and optical signal isolation are the reason secure KVMs exist: to reduce attack paths and keep sensitive environments separated at the hardware layer. For defense, intelligence, control rooms, banking, and regulated enterprise operations, the KVS4-2004VX delivers a more defensible access model than general-purpose KVM hardware. It is a premium choice when the cost of exposure is higher than the cost of the switch.