"Encourage your favorite 4-legged buddy to keep it down with the D.T. Systems Bark Boss No Bark Dog Training System. Designed to fit a wide range of dogs, this no-bark collar system offers 8 levels of stimulation and a no-stimulation audible warning beep to help you discourage unwanted barking. System also offers custom adjustment for each stimulation level with a numbered dial to help you find that perfect level of discouragement to match your dog's personality. A small, compact design, this system features an easy buckle waterproof collar that adjusts to fit necks from 7""-27"". Powered by a 6V battery (included). Easy-to-use no-bark dog training system 8 levels of adjustable stimulation Easy-to-use numbered dial adjustment Stimulation free audible warning beep Buckled waterproof collar adjusts to fit necks from 7""-27"" Uses 6V battery"