The SEC Electronic Digitol Gemini Locomotive Controller is a DC analogue speed controller without brake control simulation which is suitable for model railways and trains and is designed by SEC electronic in the United Kingdom. This unit requires a voltage input of 16v AC, provided via the brown wires, white are the track output. This is a vintage design and compatibility with DC analogue control systems, this unit is a reliable choice for collectors and enthusiasts looking to enhance their model railway experience. This is not boxed. This is a panel mount version. When I apply power it pulses the output, for that reason it is listed as spares and repairs.