This decoder is for converting Märklin/Trix H0 locomotives with built-in high-efficiency motors or other DC motors. The märklin SoundDecoder mSD3 has a wiring harness soldered to it.
The märklin SoundDecoder mSD3 supports the digital formats mfx, MM1, MM2, and DCC.
A plug for NEM 652 interface connectors is included for do-it-yourself soldering.
The decoder has preset sound for a steam locomotive.