2 Humanized bark collar modes Our anti - barking dog collar works in automatic mode and combines sound and vibration modes to prevent the dogs from barking. It helps your dog understand that it is not advisable to bark during vibrations and beeps. It is useful when you are not at home and your dog is alone. Adjustable can this anti -barking necklace has 2 buttons + -, the appropriate sensitivity can be adjusted from levels 1 - 7 depending on the size of the dog
