The Hornby Joblot Power and Control Units are a collection of pre-built speed controllers designed for model railways and trains. Made of plastic and operating on a scale of 1:76, these analogue control units have a wattage of 250W and are compatible with DCC control systems. Ideal for enthusiasts of OO gauge model railways, these units provide a convenient and efficient way to power and control your train layout, allowing for smooth operation and realistic movement of your model trains.