Description:
Item Name: Ultrasonic Dog Whistle
Material: High-quality copper + plastic
Size: length 9cm, Width 0.8cm
Function: Training dogs
Color: Silver + Black  
Included:1 x Ultrasonic Dog Whistle
Usage :
1: Unplug the whistle black shell
2: loosen the sound adjustment screw, rotate the outside adjustment lever, adjust to the best volume
3: after adjustment is completed, tighten the adjustment screw fixation
Note:
The dog Whistle is an ultrasonic wave, it may sound small, but the dog can hear very clearly。It's easy to train dog