Teach your dog not to bark gently and without the use of shocks with the PetSafe Gentle Spray Anti-Bark Collar. With a sound sensor that detects barking, this collar provides immediate correction whenever your dog barks by releasing a harmless burst of spray. The spray is designed to distract your dog so you can redirect him. Safe for puppies and adult dogs, the collar fits dogs of all sizes and is water resistant. It uses a six-volt alkaline battery which is included.