If your dog's barking is driving you crazy, this humane and painless anti-bark collar may be the perfect solution. The collar uses high-frequency sound waves and vibrations to help your dog stop barking. As the barking persists, the tone and vibrations will automatically increase through 7 levels. The adjustable, nylon collar adjusts from 10" to 22" for dogs from 5 to 150 lbs. Comes with a blue and orange cover for the microprocessor and one "6V" battery. Plastic. Device is 2 3/4"L x 1 1/2"W x 1 1/2"H.