Soundtraxx(R) Tsumami(R) Companion Plug-and-Play Sound Module -- For 50-Ton 2-Truck Climax

The Bachmann Soundtraxx(R) Tsumami(R) Companion Plug-and-Play Sound Module adds prototypical 16-but sound to select Bachmann locomotives. Locomotives require a factory-installed speaker and DCC decoder equipped with the special interface noted in the locomotive's instruction guide.