The Hornby 4 Function Locomotive Decoder may be used with all standard digital control equipment that conforms to the NMRA standards.Features: Control of the motor's rotational speed (load compensation) Acceleration and deceleration separately adjustable Selectable for operation with 14, 28, 128 speed steps Programming on main track Four On/Off function outputs.Two of the function outputs are dedicated for the head / tail lights. Operation on standard DC systems (analogue operation) possible Motor overload current protection With NMRA RP-9.1.1 / NEW652 medium plug Dimensions17 x 10 x 3.5mm Manufacturer: HornbyModel: R8249 Hornby 4 Function Locomotive Decoder