This Digitrax DH127 Series7 Mobile DCC Control Decoder is sized to fit many HO Scale locomotive models. Series7 decoders feature several available interfaces including the nine-pin harness socket, the NMRA eight-pin plug and others as noted in the product name. The decoder can handle 1.0 Amp/2 Amps peak power and 2 FX7 Functions, each with 200ma output. This Series7 decoder's FX3 outputs are optimized for either LED or incandescent bulb lighting in locomotives. FX3 outputs have configurable pulse mode available. The decoder includes a PX socket for plug n' play operation with Power Xtender (#245-PX112 sold separately) for improved operation with intermittent track power dropouts. Digitrax Series7 mobile decoders have industry standard Configuration Variable (CV) numbers and values, as well as numerous Digitrax custom CV numbers and definitions or controls. The series7 CV values are a superset of older Digitrax FX3 series3 and series6 decoders, already covered in Digitrax Decoder Manual V2.