Encourage your favorite four-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 eight 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 dogs personality. A small, compact design, this system features an easy-buckle waterproof collar that adjusts to fit necks from 7-27. Powered by a 6-volt battery, this system also offers an integrated magnetic on/off system. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Bark Collars.