PetSafe - Rechargeable Bark Control Collar

The PetSafe Rechargeable Bark Control Dog Training Collar works by emitting a safe, humane static charge every time your dog barks, whines or whimpers to help correct the noisy behavior. The bark-sensing technology will only activate when your pooch barks, and never with other noises, or even when another dog barks. The intensity of the static charge automatically adjusts down as your dog begins to bark less.