This WDK-ATL-1 WOWKit is a DCC sound total conversion solution which includes all of the components necessary to convert your engine to WOWSound with a built-in Keep-Alive™. Purchasing these various items in a single kit not only provides an economical solution it also gives you the assurance that you'll have everything you need for your install.This WOWKit makes for a simple and easy installation so organized and clean it makes everyone look like a professional! Each WOWKit has beautiful installation pictures on our website which will guide you confidently through the installation process. Included in this WOWKit: 1x WOW121-Diesel Decoder 1x AK-MB1 WOWMotherboard with a built-in Keep-Alive™ 1x 35mm x 16mm WOWSpeaker (with speaker wires) 1x ATL-SH1 Speaker HousingThis kit fits the following Atlas HO-Scale Locomotives: