Control up to 8 VGA & USB (Universal Serial Bus) computers from a single keyboard, mouse & monitor. The SV831DUSBAU 8 Port Rack Mount USB (Universal Serial Bus) VGA KVM Switch (with Audio Cables Included) means that you can control up to 8 USB (Universal Serial Bus) computers using a single keyboard, mouse & monitor, & features Audio & Microphone ports to switch between audio signals as well as PC ports. Based on a 1U rack mountable slim form factor design, this 8 Port USB (Universal Serial Bus) KVM uses rear cable connections to maximize space efficiency. Multiple KVM units can also be connected (cascaded) together for control of up to 64 computers, ensuring a scalable KVM solution that can be expanded as necessary. To ensure seamless operation, the switch features automatic & manual scan modes, supports both hot-key & front panel push-button switching, & features a convenient OSD (on-screen display) for added configuration options.