This lightweight professional dog whistle, allows you to adjust the pitch, to suit your dog's sensitivity or change the tone for different dogs.It is easy to change the pitch on the Professional Dog Whistle, simply separate the 2 parts of the whistle, rotate the nut to adjust pitch and secure both parts back together.Whistles are great for recall training as they help to standardise commands and are really useful if different people are training or walking the same dog.Super-light and compact in..