Pet Dog Training Adjustable UltraSonic Sound Whistle

Pet Dog Training Adjustable UltraSonic Sound Whistle
Material: Brass
Length: 5.5cm(approx.)
 
Note: The dog whistle'sound includs 2 parts. Part 1: the Ultrasonic. Human's ear can not hear it,but dog can hear it.
Part 2: These light sound can be heard by human, which help owner sound a long or short whistle to train their
Adjustable pitch, simply tighten or loosen the screw to work out your dogs frequency.
It should be noted that this whistle is audible to the human ear, essential for gauging its efficiency.
Package includes:
1 X  Dog Training UltraSonic Whistle