Dog whistle to stop barking Dog Whistle, Ultrasonic Dog Training Whistles with Adjustable Frequencies, whistle dogAdjustable Pitch Ultrasonic Training Tool Silent Bark Control for Dogs (2 Pack).

Size:2 Pack Professional Ultrasonic Dog Training Whistle?2 pack? Specification Material: Copper Metal & Environmental Plastic Color: Black dog whistle lanyard wearing length: 16.55 in weight: about 0.11lb / 50g Size: Length:3.15 inch/8cm NOTE : This silent dog whistle emits an ultrasound, which you may NOT be able to hear, but dogs can hear it. Remember to try different frequencies to see which one your dog responds to the strongest. Change the behavior of your dog by training. For example, at mealtime, blow on the whistle before receiving food. It will only take a few attempts before your dog gets bored. USER GUIDE 1. Adjust the pitch and blow the whistle to train your dog. 2. Continue testing until your dog responds. 3. Notice your dog's reaction to eachtting until your dog exhibits the strongest reaction. 4. Have different cues for different duration/frequency of pitches for smart dogs. 5. Keep your whistle command consistent. 6. Reward your dog If it responds positively.