The Model 515 is a high performance switching system for video components. It provides an inexpensive convenient way to switch between up to 5 video components having line-level outputs (composite video & stereo audio). These may include products such as TV tuners, video disc players, satellite receivers and, of course VCRs. The signal from the selected video / audio component appears at the output of the 515, unaltered by its passive circuitry, and completely free of crosstalk or video bleed-through from the unselected components. Measurements are posted in the pictures. Please feel free to reach out with any questions you may have. I will do my best to answer your questions and can provide more pictures if need be. Priced low to sell fast. I have so much that I can’t keep up with posting it. Thank you for your interest and support.