SK21D−3 is a secure 2−port, small−form−factor DVI−I KVM switch. It enables users to share peripherals − keyboard, mouse and monitor − between two different security−level networks/computers. SK21D−3 provides the highest possible isolation between two connected computers and is NIAP Common Criteria Protection Profile version 3.0 (PP3.0) certified.

• Small Form Factor — Occupies minimum desktop space.
• DVI–I Video Support — DVI–I 4K UHD with resolutions up to 3840×2160 @30Hz (via DVI to HDMI cable) and DVI dual–link with resolutions up to 2560x1600 @60Hz (via DVI cable); two computers connected to a single display.
• AUX Channel Protection — Patented AUX channel firewall technology prevents leakage, signaling attacks prevented by design, fully functional EDID.
• Highest Security by Design — NIAP Common Criteria PP3.0 for Peripheral Sharing Switch (PSS) devices.
• Hardware–Based Peripheral Isolation — No dependency on firmware or software, all firmware on ROM, no keyboard buffering or memory.
• Unidirectional Optical Data Diodes — Assures USB peripheral isolation, data flows from devices to host only.
• Peripheral Security — Full USB device filtering to assure support for keyboard and mouse only.
• Active Anti Tampering System — Always–on with 10 years battery, holographic tampering evident labels.