The Bark Control Collar By Staywell is a best-selling lightweight collar that?s controls your dogs excessive barking. Are you ready to experience 'quiet' again? The waterproof collar weighs 1.5 ounces / 42.5g and has an adjustable nylon strap. It uses a simple vibration sensor to detect your dogs barking. The safe and gentle stimulation level automatically increases through six levels if your pets barking continues. He'll quickly learn the association and stop the unwanted behavior. The collar uses an RFA-118 battery which is included.