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.
 
Bring the sounds of Sodor to life with a separate-sale Sound Module to install in your Large Scale Thomas & Friends(TM) engines. Solder pad installation and customer-supplied speaker required. Dual-mode DCC/DC operation. Sound package includes whistle or bell per prototype, chuff and cylinder blow down. Also controls customer-installed headlamp(s) if desired. Character sound suites available through DCC CV selection only. Character sound suites include Thomas, Percy, James, Edward, Henry, Gordon, Emily, Spencer, and Toby. Factory pre-set for Thomas. Approximate board dimensions: 60mm x 30mm x 15mm.