Your dog will soon be quiet with the SportDOG NoBark 6 Electronic Dog Collar. With six levels of correction, the collar will automatically adjust to deter your dog's barking. This collar is easy to use as no programming is required, and it resets itself to the lowest level of correction after 30 seconds of silence. The adjustable collar can fit neck sizes ranging from 6" - 28". Simply adjust to the right size for your dog and turn the battery on to begin training. Includes one RFA-67D-11 battery with a six month battery life.