Consolidate server access without sacrificing control. Eaton’s B042-004 4-Port USB/PS2 KVM Switch gives administrators a compact rack-mount platform for managing up to four computers from one keyboard, monitor, and mouse set. Its USB/PS2 flexibility matters in mixed environments where legacy systems and newer hardware must coexist without extra adapters or separate workflows. The on-screen display makes port selection and switch management straightforward, while password protection and auto-scanning support disciplined day-to-day operations. For teams that need to grow beyond a small rack, the dedicated daisy-chain port expands the system to as many as 128 computers, turning a four-port switch into a scalable control point for larger server rooms and distributed infrastructure. This is the kind of KVM switch that earns its place in professional environments: simple where it should be, flexible where it needs to be, and expandable when the rack grows. For organizations balancing uptime, access control, and budget discipline, the B042-004 delivers the core functions that matter without excess complexity.