The SW series switchers provide switching between analog video sources and destination devices using BNC input and output connectors.  Multiple switchers can be looped to increase the number of inputs.  Audio signals can also be switched via the BNC connectors for composite video or S-video type inputs. All of the switchers except the SW 6 Component provide RGBS, RGsB, component video, S-video, and NTSC/PAL composite video switching.  The HV switchers can also switch RGBHV signals. The number in the model name indicates the number of inputs available.  For example, the SW2 AR HV AS includes 2 inputs.