Metal shepherd dog whistle produced by the English company ACME. With this whistle it is possible (after learning) to emit different tones of whistle so that you can give various commands to your dog even at great distances. It is the classic whistle model used by shepherds to guide dogs while leading the flock.
It should be noted that this whistle emits sounds only if used in the correct way (it is not enough to blow as for the other whistles, it takes time and exercise to master this instrument)
Attention: for hygiene reasons it is not possible to replace this product if used