Designed for use in secure defense and intelligence applications, this SDPN-4S 4-Port Single-Head 4K DisplayPort KVM Switch from IPGard features mechanical, electrical and optical signal isolation to prevent hacking and data leakage. It controls data relays using inverted signals, shielding connections from outside intrusion by forcing them to work one at a time. Each port uses its own isolated data channel and each unit features a non-reprogrammable ROM to protect the switch's functions. The switch emulates the presence of a keyboard and a mouse for every attached computer through a USB cable, preventing direct connection between the peripherals and the connected computer.