*HARDLY USED - WAS USING IT FOR A OLDER SET I USE TO RUN UP GRADED TO A NEWER SYSTEM WORKS AWESOME The MTH RailKing Z-1000 Hobby Transformer & Controller is a 100-watt power supply designed for model railroads and trains. Specifically geared towards O gauge enthusiasts, this AC-powered unit offers a range of power levels from 40 to 1000 watts, allowing for customizable control over the speed and operation of your train layout. With the MTH brand known for quality and reliability, this transformer and controller set is a must-have for hobbyists looking to enhance their model railroad experience.