USB Dual View DVI KVM Extender with Audio and RS-232 (60m). The CE604 is a DVI Dual View USB based KVM Extender that features Dual View functionality, which enables the video output to seamlessly display on two monitors. With RS-232 serial functionality, it allows access to a computer system from a remote console up to 200 feet (60 m) away. The CE604 is built for control and security purposes, and is targeted towards financial and industrial markets.