Railpro LM-3S-21 21pin sound board, HO scale

21 Pin Model Train Decoder with Sound The LM-3S-21 is a module that you can install into a model train locomotive so the locomotive can be controlled and setup by a Ring Engineering RailPro Controller, such as the HC-3 Handheld Controller with a Color Touch Screen! After the LM-3S-21 is installed in a locomotive, you will be able to control the locomotive speed, direction, up to 12 light outputs and sounds! The LM-3S-21 has “Direct Radio” (RF transceiver) built inside. The built in RF module allows commands and data to be sent and received to and from the module. You can load a picture of your choice into the LM-3S-21 module. Then you will be able to touch the screen of the HC-3 to take control of your locomotive! You can even download new sounds and light effects using the built in Direct Radio! The LM-3S-21 is electrically compatible with the DCC plug found in many locomotives to promote easy installation.