WOWKits provide everything needed for a complete sound installation. This WOWKit includes: A WOWSound decoder TCS motherboard with on-board Keep Alive® Speaker with speaker wire and enclosure Each WOWKit has been engineered for a perfect fit in your locomotive. Even if you are new to DCC or DCC installations, you can achieve Easy, Clean, Professional results using WOWKits. WOWKits make sound installation as simple and all-inclusive as possible. A list of compatible locomotives for this WOWKit can be found in the "Compatibility" tab. The TCS website features step-by-step installation pictures and instructions for each WOWKit. Visit the installation pages and search by locomotive, or follow the link in the "Compatibility" tab!