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The Black Box KVS4-2004HV is a four-port secure KVM switch that lets one keyboard, monitor and mouse control four computers across separate security domains. Its FlexPort inputs accept either HDMI or DisplayPort on each channel, so mixed-graphics fleets work without adapters. It is built for government, defense and financial desks that must stop data crossing between classified and unclassified systems, and it carries the NIAP Common Criteria certification those buyers require. Against ordinary KVM switches it costs far more and tops out at 4K30, but it isolates each port with no shared memory and blocks USB peripheral attacks, which consumer switches do not attempt.
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Lowest price we've seen: $914.80 on Nov 11 at Amazon. Tracked across 2 stores since Nov 11.
Buyers are mostly IT and security teams who need certified cross-domain switching. They report it does the isolation job reliably and the FlexPort inputs simplify mixed-cable desks, but note the 4K30 ceiling and the cost.
The Black Box KVS4-2004HV is a secure KVM switch. It is a FlexPort model that works with HDMI and DisplayPort video.