SM40NU-3 is a secure 4-port KM switch. It enables users to share peripherals - keyboard, mouse, audio and USB - between four different security-level networks/computers while isolating all hosts and protecting against data leakage and malicious attacks through shared peripherals. It also enables assigning a USB port to a specific computer while switching other peripherals, such as when a USB smart card reader must remain mapped to a certain computer. SM40NU-3 provides the highest possible isolation between connected computers and is NIAP common criteria protection profile version 3.0 (PP3.0) certified.