Thank you for viewing. This is a Märklin AC (alternating current) 100V controller (power pack), output confirmed. It's an old item, but I think it's in good condition for its age. This model was imported by Fuji Sho, the former Japanese general agent for Märklin, so it can be used without any problems with household outlets in Japan. When listing, I checked the output with a digital multimeter (DMM) to ensure it met the specified values, and then tested it by running several analog locomotives of different types. All plugs and outlets have been cleaned with a second-class alcohol-based solvent for electronic parts cleaning, so there are no contact problems. All vehicles run forward and backward without any problems, and the reversing switch operates smoothly. <Specifications> ・Red (B) is for the 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 exterior, but no major damage, and the output values are normal, so this is an analog transformer that can still be used actively. If you already have one, how about using this as your sub-controller? Please understand that this item has been in someone else's possession and is being sold as-is, non-returnable. This is a valuable item, so it will be carefully packed and shipped anonymously via Yu-Yu Mercari or Rakuraku Mercari, with shipping costs covered by the seller. ※Cannot be used as a controller for mini-club (Z gauge). Märklin HO gauge Model Railroad