NixTrainz NTZ5, Decoder Buddy V5, 12 Outputs With 2.2K Resistors, Includes One Mother Board and One Connector Board Decoder Buddy makes connecting your 21-Pin decoder to your HO Scale locomotive super-easy. Now a 21-pin-friendly board replaces the standard DCC 8-pin loco motherboard and easily allows you to take full advantage of all the functions and features of the latest, feature-rich decoders. Benefits Include: Popular 21-pin decoders from TCS, SoundTraxx, ESU and Digitrax easily fit 10-pin socket and plug with wire-outs for all 21-pin decoder functions 10-pin plug fully removable for easy separation of loco shell and chassis On board resistors for LED lighting provided Connections for 12 lighting functions On-board soldering pads for connecting a stay alive capacitor of your choice Older 8-pin loco motherboard weaknesses solved with Decoder Buddy Fits Most HO Scale Locomotives Dimensions: 2.20" x 0.67" x 0.35" (56 mm x 17 mm x 0.9 mm) Makes for easier DCC decoder installation in the some of the tightest locomotives.