Petsafe Indoor Ultrasonic Bark Control System

If there's something more annoying than constant barking, it's an ultrasonic tone; good thing humans can't hear it! With the PetSafe Ultrasonic Indoor Bark Control, there's no need for bulky battery collars or static correction - set the unit on a table, turn it on, and that's it! Every time Buster barks, the UltraSonic Indoor Bark Control emits a high-pitched, ultrasonic tone only your dog can hear. Buster's gonna learn - no barking, no annoying squeal. Win-win!

High-frequency ultrasonic sound disrupt nuisance barking without a collar.
For indoor use only, table-top or hand-held use.
Activated automatically by bark or manually by owner with up to a 25-foot range.
Works on all dogs within hearing range except for dogs who are deaf or hard of hearing. They won't respond to the ultrasonic tone.
Uses a 9-volt alkaline battery (not included), average battery life is 6 months depending on how often the dog barks. Also has a low-battery indicator.