HighSecLabs SK21D-3 User Manual page 9

Main Features (Cont.)
"Freeze Audio" feature
Dedicated "Freeze Audio" push button on front panel enables to lock
this function to a specific channel in a way that switching between
channels leaves the audio function locked to current channel.
Small form factor:
Small form factor product occupying minimum desktop space.
Video Support

SK21D-3 supports DVI-I displays as well as VGA and HDMI
via compatible cables.

SK21P-3 supports DisplayPort1.1 & 1.2 displays.

SK21H-3 supports HDMI displays.
Resolutions Supported
Products support video resolutions of up to 4K-2K Ultra HD (3840 X
2160 pixels).
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Section 4 - Operation
2-PORT SINGLE-HEAD SECURE KVM: SK21D-3 – DVI-I VIDEO, SK21P-3 – DISPLAYPORT VIDEO, SK21H-3 – HDMI VIDEO