The Hornby R951 Zero 1 Slave Control Unit is a vintage analogue control unit designed for model railways in 1:76 scale. With a wattage of 250W and ready-to-go assembly status, this plastic unit from the 1980s is compatible with DCC control systems and is ideal for enhancing your collection of model trains. This Hornby control unit, although untested, is a valuable addition for enthusiasts looking to upgrade their power and control setup.as new used only a few times i have 2 of these listed.