The Black Box SS4P-KM-UCAC is a high-security, 4-port “KM” (Keyboard/Mouse) switch with CAC support — part of Black Box’s “Secure KM Switch” line — engineered to give a single user console (keyboard, mouse, speakers) secure access to multiple computers, while guaranteeing strong isolation between each connection. It’s ideal for environments where data security and controlled separation between systems is critical.