Effect good, quality ok

The effect of the whistle is excellent, but it is certainly not to be called silently. Even when set to the highest frequency it is very clearly audible and not very quiet, but of course quieter than a normal whistle.

The whistle is very long and that is disturbing and the reason why I have taken away the cover, thus saving you a few centimeters.

If you have chosen a Tonlae should fix the setting of threads with a screw locking (Loctite), otherwise the parts resolve after a short period.

This might sound all negative as it is meant for who heeded the upper notes get a good product.