This is the long pin version compatible with Soundtraxx and other 21-pin decoders!
 
This motherboard is designed to replace the original lighting board in Atlas and Kato diesel locomotives. Included on this motherboard is a KA2 Keep Alive® for smooth operation over troublesome tracks. Pair with a WOW121 for unparalleled sound and interruption-free performance.
 
NOTE: This product does not function without a decoder. Pick up an EU621 or WOW121 decoder to use this product.
 
Dimensions: 2.93” x 0.66” x 0.33” or 74.5mm x 17mm x 8mm
Scale: HO Scale
Compatibility: WOW121-Diesel