Dogs are honest friends for humans. They live with your family as a family member but sometimes they act very strange. Everybody feels fear when dogs bark. When a street dog barks, your dog also bark, but you do not like unnecessary barking, or you want to train your dog by yourself. Then you need bark control device because this device can train your dog without harming them.We have developed this ultrasonic bark controll to help you a way to control bad dog behavior like begging for food, non-stop barking at the doorbell, barking late at night, destroying your couch cushions or whatever other annoying pet behavior that needs to end. [Working principle]-When the dog's bark is detected by the product's microphone, the product will automatically emit a high-frequency ultrasonic wave. This ultrasonic wave cannot be heard by human ears but can be heard by dogs. This is a harsh noise for dogs, so The dog will stop barking and leave.[Features]-The product can prevent dogs from barking too much to affect you and your neighbors. Outdoor ultrasonic bark stoppers can effectively block dog barking and do not need to receive collars. Safe and effective, suitable for all breeds and sizes of dogs.Warm reminder: Ultrasound only lets the dog hear something that makes him uncomfortable, there is no substantial punishment.It doesn’t cause them any pain, or hurt them at all, but it will help stop their bad behaviors. 
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