Usually inaudible to human ears, this premium quality Sprenger dog training whistle can be heard by dogs at a range of 150 - 400 metres.
The pitch can be varied with a screw adjustment and fixed by means of a locking nut. Simply remove the black plastic casing in order to adjust the pitch.
Comes with a plastic sleeve to protect whistle when not in use.
Can be used successfully to deter nusiance barking.