Gaugemaster Wall Mounted Transformer 12v DC Smooth Regulated Details: Single track controller designed to allow the operator to control the layout away from the control panel. This controller has a rotating dial to control the speed of one locomotive and a DPDT switch on the circuit to control the direction of travel, you can also switch it to the center position to cut off the power to the track. This controller does not come with a transformer so you will need to use a 16v AC supply which can be applied by wiring the controller directly to a transformer or via one of our GM75 plug and sockets. HO Scale, N Gauge, OO Scale, OO9 Scale. The following power supplys can be used to power this unit. GMC-M1 - Cased Transformer GMC-T1 - Open Transformer GMC-WM1 - Wall Mounted Transformer INPUT 16v AC CONTROLLED OUTPUT 12v DC CURRENT RATING 1.25A MEASUREMENTS LENGTH 90mm HEIGHT 58mm DEPTH 38mm WIRE LENGTH 1.5m Technical Details: INPUT 16v AC CONTROLLED OUTPUT 12v DC CURRENT RATING 1.25A Measurements: LENGTH 90mm HEIGHT 58mm DEPTH 38mm WIRE LENGTH 1.5m