The human ear can hear only a quiet high pitched note, but a Bullmastiff can pick up this sound at a distance of up to 400 yards (depending on direction and strength of the wind). The tone can be adjusted by turning the screw after removal of the protective cover.
During training it is very important the same pitch of note is always maintained. The plastic cover will protect the whistle from dust when carried in a pocket.
Silent Dog Training Whistle Herm Sprenger for Bullmastiff trainers
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