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. Backed by a StarTech.com 3-year warranty and free lifetime technical support. The StarTech.com Advantage - Rugged, rack mountable 1U metal chassis is ideal for any environment - User friendly access through the OSD saves configuration time and frustration - Extracting the keyboard strokes from the USB connection this KVM enables hot key support for wireless keyboard and mouse combo kits that use a single USB receiver