The Digitrax DB 210 Opto 3/5/8 Amp Outputs is a digital controller designed for model railroads and trains. With DC power type and compatible with DCC control systems, it offers precision control for multiple gauges. The voltage range of 15v-20v ensures reliable operation for your model railroad setup. The Digitrax brand is known for its quality and innovation in the world of model railroads. This is used and sold as is.