Pet owners can keep their puppies down to a whisper with one or two Bark Stop Collars. Training dogs to tone it down, the Collars control excessive barking by sending out an ultrasonic signal that only dogs can hear. Adjustable and stretchy, the Stop Bark Collar triggers accurately from barking vibrations and ensure canines donâ??t exceed woofing expectations. Train and stop any dog from nuisance barking Control your dog's excessive barking in a humane way that actually teaches them not to bark Collar sends out an ultrasonic signal that only dogs can hear Adjustable sensitivity setting for high or low vibration Choice of either Ultrasonic or Audible training frequencies Easy to use with adjustable collar so one size fits all Water resistant construction Adjustable stretch collar Ultrasonic or audible selections Triggers accurately from Barking Vibrations (only by the dog wearing it) Length: 11.8" (stretchable to around 23.6 cm) On/Off button Dimensions: 2.4 "x 0.6" x 2.4"