The Model DVS-4A is versatile and compact 4 input x 1 output DVI and audio switch. This unit provides both video and audio output that can be switched between four video and audio sources. This allows routing of multiple DVI equipped devices (such as PC’s) to single DVI display (such as plasma or LCD screen). The switcher supports single-link, DVI-D video signals at resolutions up to 1920x1200 and HDTV up to 1080p. DVS-4A unit provides all A/V and control connections on rear panel, front panel has push-button switch with corresponding LED indicator for selection of video source. This unit can be controlled by either manually using front panel switch, automatically based on video detection, or remotely through an RS-232 serial port. Unit can be configured to operate in three different modes, which are auto, scan and manual modes. Unit also has EEPROM (internal non-volatile flash memory) to store the last operating mode when power is off.