PetSafe(R) Rechargeable Bark Control Dog Collar The Rechargeable Bark Control Collar from PetSafe discourages nuisance barking, whining, and whimpering. As your dog barks, the collar automatically adjusts to give a safe but annoying static correction. As your dog learns to bark less, correction levels are reduced. By utilizing unique bark-sensing technology, the collar provides the most reliable bark detection available. The collar only activates when your dog barks. It will not activate in response to another dog's barking or other noises. Can be used with all dogs 8 pounds and over and with neck widths up to 28 inches. Features: Static correction is adjusted according to how often the dog barks with Temperament learning 15 adjustable levels of static correction New technology prevents barking, whining, or whimpering Automatic safety shut-off Waterproof Rechargeable Lithium-ion battery (built-in; non-replaceable) Each batter charge lasts of to 80 hours, depending on use Low battery indicator and 2-hour quick charge Item Specifications: System Includes: Rechargeable Collar and Adjustable Strap, Charging Adapter, Test Light Tool, Small and Large Probes, Quick Start Guide, One Year Manufacturer Warranty.