HDN-4Plus is a dedicated multi-platform KVM switch capable of managing four computers through a single HDMI monitor, USB keyboard, USB mouse, and other USB 2.0 devices. This is the first KVM switch on the market that features support for 4K Ultra HD (3840x2160 @30Hz) workstations. The device also features SmartPreview technology, which enables simultaneous picturein-picture monitoring of the other sources connected to switch. This helpful technology allows users to keep tabs on the other connected workstations without constantly needing to switch back and forth.

The USB emulation technology utilized by HDN-4Plus enables immediate hot key source switching through a remote USB keyboard and mouse. HDN-4Plus is HDMI 1.4 and HDCP compliant, which supports 4K Ultra HD resolutions and 12-bit deep color at 1080p @60Hz. RS-232 control and front panel switching are supported. The switch also transmits digital audio, including a separate S/PDIF digital audio output for increased flexibility.