Features: 【3 LEVELS DOG BARKING SILENCER】 The dog barking deterrent device has 3 levels of frequency (15KHZ-30KHZ). Different dog may be sensitive to ultrasound in different frequency bands. It has 3 adjustable ultrasonic frequency levels including 30KHz for small dogs, 20KHz for docile dogs, and 15/30KHz for large dogs. The frequency of the bark control device can be changed once a week to maintain the best anti barking effect. You can use this stop barking device to train your dog's behavior. Let you and pet dog harmony. .
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