High Tech Pet Hush Puppy Sonic Bark Control Collar Effective, affordable and humane Uses harmless sound, not shock, to make your dog stop barking fast User-adjustable sensitivity control lets you tune the microphone to your dog's individual voice, minimizing false triggers User adjustable output level lets you control the amount of sound stimulus that is just right for your pet High quality nylon strap adjusts from 5 to 24-inch