The Z21 signal decoder is a universally applicable DCC decoder that is particularly well-suited for complex LED signals. The operation is especially convenient with the Z21 app, as the signal types are preloaded and can be automatically read. This can be easily done via the Z21 pro link. Over 30 signal types are included, such as: Germany: H/V-, Ks-, HI signals, and shunting signals. Austria: main signals of types 1980 and 1954, distant signals, protective signals, and shunting signals. Switzerland: System L, System N, signals for shunting service. With the update function via the Z21 pro link, additional signal types can naturally be added in the future.