Super Bark Free Pro Series helps train your dogs away from boredom or annoying barking habits. It emits corrective ultrasonic frequencies which can only be heard by dogs, or lower sound tones audible to human ears.Your dog's bark automatically triggers corrective ultrasonic bursts to help correct boredom or annoyance barking habitsDual speakersSelector switch for ultrasonic or audible settingsSensitivity selector slide switch adjusts to your dog's barking pitchTest button wall mount or built-in standing designPowered by adapter (included) or 4 "D" Batteries (not included)Twin dual piezo-ceramic transducers50' low-lead cable includedUp to 50' radius coverage area
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