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Manual Video Switchers Model MS500 - 4 video inputs, 1 video output. Model MS508DT - 8 video inputs, 1 video output. Model MS512DT - 12 video inputs, 1 video output. Model MS540DT - 120 VAC. 40 video inputs, 1 video output. Model MS504GDT with illuminated pushbuttons - 120 VAC. 4 video inputs, 1 video output. The MS500 Series of manual, passive switchers provide an economical means of switching from four (4) to forty (40) inputs to a single monitor. The interlocked manual pushbutton switches provide 75 ohm termination at each switch. The MS500L Series of manual, looping switchers provide the same functions as the MS500 manual switchers except no termination is used and connectors are provided so that the video inputs may be looped through and terminated elsewhere. Pelco has engineered a unique method of selecting over 18 inputs. By inter-wiring two sets of switches (4-position and 10-position), you can economically and reliably switch up to 40 inputs in only 1.75 inches (4.45 cm) of panel height on most models. All switchers are desktop models. Optional rack mounting kits are available. Audio follow options of single (AF) or balanced (BAF) audio are available for up to 18 positions. AF switchers are equipped with SPST normally open switch closures for each position; BAF switchers have DPDT normally open switch closures for each position. Product Features ECONOMICAL 4-40 INPUTS TERMINATING OR LOOPING DESKTOP OR RACK MOUNT COMPATIBLE WITH COLOR OR B/W COMPOSITE VIDEO SIGNALS SINGLE MONITOR OUTPUT (EXCEPT 40-POSITION SWITCHER WHICH HAS TWO MONITOR OUTPUTS) 120 OR 230 VAC INPUT (MS500GDT, MS500GLDT, MS540DT AND MS540LDT SERIES ONLY)