The XTENDEX transparent USB Extender with DVI Video, Audio and RS232 via Fiber extends four USB devices, RS232, speakers and a single link digital DVI display up to 6,500 feet via two duplex singlemode LC fiber optic cables.</p><p>Each DVI USB KVM Extender consists of a local unit that connects to a computer and provides local keyboard, monitor and mouse connections, and a remote unit that connects to four USB devices, a DVI display, and analog stereo audio speakers.</p>