This SoundTraxx TSU- PNP8 Tsunami2 Digital Sound and Control Decoder is a universal, eight-function factory board replacement sound decoder suitable for use in many manufacturer's models such as those made by Atlas, Athearn, and InterMountain Models. It is suitable for a wide variety of models from HO to S scale. The TSU-PNP8 includes a connector to easily add a CurrentKeeper 678-810140 to maintain performance over dirty track and switches. Tsunami2 decoders are equipped with a 32-bit processor that provides horsepower to support 28 functions, 16 polyphonic sound channels, 50 individual sounds, and more than 20 lighting effects, Tsunami2 Decoders provide high quality onboard locomotive sound, precision motor control and brilliant lighting effects, as well as the first ever Reactive Diesel Dynamic Digital Exhaust for more authentic operation.