[rmoriz]

The presentation looks like marketing overkill, their solution looks pretty simple. It‘s just two trills „Trillerwerk“ bells combined. It was the standard in Germany until the late 1990s https://youtu.be/-mW7dWHDivo

[layer8]

They are still readily available. I suspect that the only reason they aren’t standard anymore is to save 5 Euros on a new bike.

[eru]

That guy should lead with the sound check. :)