The Hornby R7229 Analogue Controller & Mains Transformer is a pre-built speed controller designed for use with model railways. With a power output of 250W and compatible with both DC and DCC control systems, this unit is ideal for enthusiasts looking to operate their layouts smoothly. Made from durable plastic, it offers a reliable and efficient power supply for your model railway. Perfect for those who prefer the traditional analogue control system, this controller is a must-have for any Hornby enthusiast.