Startech 8 Port USB VGA KVM Switch with Audio The SV831DUSBAU 8 Port Rack Mount USB VGA KVM Switch (with Audio Cables Included) allows you to control up to 8 USB computers using a single keyboard, mouse and monitor, and features Audio and 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 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 and manual scan modes, supports both hot-key and front panel push-button switching, and features a convenient OSD (on-screen display) for added configuration options.This product is TAA compliant and backed by a Startech.com 3-year warranty with free lifetime technical support.The SV831DUSBAU only works with specific 2-in-1 VGA and USB cables (sold separately), a list of StarTech.com approved cables are below:6 ft Ultra Thin USB VGA 2-in-1 KVM Cable6 ft Ultra Thin USB VGA 2-in-1 KVM Cable10 ft Ultra Thin USB VGA 2-in-1 KVM Cable15 ft Ultra Thin USB VGA 2-in-1 KVM Cable