The Rechargeable Bark Control collar stops nuisance barking. The patented Perfect Bark ensures your dog’s bark is the only sound that will cause a correction. This user-friendly bark control collar automatically customizes its correction to give dogs the most fair and effective training possible. Matched with all-weather durability, this collar provides perfect combination of toughness and intelligence. The collar has three modes of correction: temperament learning, progressive correction, and manual/user-selected mode. Waterproof receiver collar with rechargeable battery (built-in; non-replaceable). Each battery charge lasts 3-6 months. Collar includes a low-battery indicator. For dogs 40 pounds and up Fits neck sizes up to 28 inches 10 adjustable levels of static correction Perfect Bark sound and vibration sensors - only your dog’s bark causes correction Automatic safety shut-off: correction stops after 80 seconds