Soundtraxx(R) Tsumami(R) Companion Plug-and-Play Sound Module -- Fits Bachmann Spectrum(R) Baltimore & Ohio EM-1

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.