Thank you for viewing. This is a Märklin AC (alternating current) 100V controller (power pack), output confirmed. This model was imported by Fuji Sho, the former Japanese general agent for Märklin, so it can be used with standard household outlets in Japan. Before listing, I checked the output with a digital multimeter (DMM) to ensure it met the specified values, and then tested it by running several different types of analog locomotives. All vehicles ran forward and backward without any problems, and the reversing switch operated smoothly. However, there is a slight "humming" sound (magnetostriction noise). This is not a malfunction, but if you are concerned, please refrain from purchasing. All plugs and outlets have been cleaned with a second-class alcohol-based solvent for electronic parts cleaning, and of course, there are no contact problems. <Specifications> ・Red (B) is for vehicles, providing AC 7-16V operating power (24V output only during reversing operation) ・Yellow (L) supplies 16V current to accessories such as points and signals ・Brown (O) serves as the return path for the current from Red (B) and Yellow (L) There is no original box. Please check the condition in the photos. There are some minor scratches on the control panel. The output is normal, but if you are concerned about the sound, please refrain from purchasing. I plan to ship anonymously via Yu-Yu Mercari or Rakuraku Mercari, with shipping costs borne by me. ※Cannot be used as a controller for mini-club (Z gauge). märklin Märklin HO gauge model railway maerklin MARKLIN HO vintage rare Marklin model railway retro TRIX HO Eisenbahn Märklin vintage