"The High Tech Pet Super Hush Puppy is an advanced dog training collar which automatically increases sonic output until your dog is quiet. No shock stimulus is used. The bark control collar uses a microphone to detect your dog's bark minimizing false triggering. The Super Hush Puppy effectively stops barking because it quickly teaches your dog a pattern which is in direct response to the animal's behavior. Clinical tests show the Super Hush Puppy to be effective for over 90% of nuisance barking in dogs. The Super Hush Puppy is water resistant and operates using a 6-Volt battery (not included). The high quality nylon strap adjusts from 5"" to 24"" and may be used on dogs from 5-200 lbs."