PetSafe Indoor Bark Control Size:1 pack The collar will only activate

The collar will only activate when your dog barks

Transparent flap features 4-way operation

Power: 1 3-V CR123A Lithium battery (supplied)

Plush medical grade orthopedic foam

Exterior surface is tougher than ever

PetSafe Indoor Bark Control Size:1 pack The collar will only activateUsing the adhesive backed hooks, simply place one of the devices on a wall, door frame, or table in whichever room your dog barks the most. Whenever your dog barks, the device emits an unpleasant ultrasonic tone that's inaudible to most humans. Your dog will learn to associate his barking with the high pitched sound and stop barking. Most dogs bark less within a few days. The deterrents are available in single or dual packs for homes to cover multiple