This TECH 4 MRC 200 Train Controller from Model Rectifier Corp is a versatile piece of equipment for enthusiasts of model railroads and trains. With the ability to operate on five different gauges - HO, N, O, S, and Z - it offers a wide range of options for powering and controlling your collection. The controller is designed to work with transformers (not included) and has four control knobs, allowing for precise adjustments to speed and direction. It is a great addition to any train setup and will provide hours of enjoyment.