SmartAVI 4-Port Dual HDMI KVM Switch with USB 2.0 and Audio SharingThe HDN 4 Duo from SmartAVI is built for serious multisystem workflows. Its a dedicated 4port dual HDMI KVM switch that lets you control up to four different computers from a single workstation, using two HDMI displays and one USB keyboard and mouse. This device is engineered to streamline complex setups where space, efficiency, and reliable peripheral sharing matter most. With USB 2. 0 compatibility and audio sharing, you can manage multiple machines