The feedback decoder is compatible with the Märklin Interface, the Märklin Memory, the Uhlenbrock Intellibox, and the Viessmann Commander. The module's 16 inputs can be used for occupancy detection or to trigger memory switching functions on turnout tracks, switching contacts type 6840 (H0), or directly on contact track sections for Märklin K and C tracks. A 15 cm long flat cable with an original s88 connector is included. Specifically for two-rail tracks, we recommend using the feedback decoder with the track occupancy detector type 5233.