The Extron SW 4AV RCA is a high performance composite video with stereo audio switcher. It features a genlock input and vertical interval switching, providing synchronization of video signals of one device with those from another video source and resulting in smooth and clean transitions when switching between inputs. It also includes adjustable gain and attenuation, allowing users to set the individual input audio levels, providing no significant difference in volume when switching between sources. All SW AV four and six input switchers offer multiple forms of control, including front panel buttons, RS-232, or auto-input switching. They can also be controlled via two different, optional remote control devices: the Extron KP 6 keypad and IR 102 universal remote.