The ATEN 4-Port USB - 4K HDMI Secure KVM Switch (PSD PP V4.0) is a secure KVM switch for high-security environments. It supports up to 4 computers and 1 local user, with 4K HDMI output and source isolation designed to prevent data leakage during switching.

Based on available information, this ATEN product is certified for protected environments PSD PP v4.0. It supports resolution up to 3840 x 2160 at 50 Hz or 60 Hz, includes 6 USB ports and 5 HDMI ports, and is suitable for rack mounting.

It may include CAC support and DisplayPort or HDMI adapter kits in selected variants. It is designed for use in defense, intelligence, government services, and other environments requiring strict isolation between systems of different security levels.