The MTH 40-4000 O Z-4000 400W Dual Control Transformer is a high-quality transformer designed for model train enthusiasts aged 17 years and up. Made by the reputable brand MTH, this transformer provides dual control capabilities for regulating the power and speed of model trains, allowing for precise and smooth operation. With a power output of 400W, this transformer is suitable for accommodating a variety of trains and layouts, making it a versatile and essential component for any model train setup.