The Petsafe PBC00-10782 Deluxe Little Dog Bark Control Collar is designed specifically for small dogs. It has two primary features designed to shorten the training phase and promote good behavior. First, the bark control collar has a unique patented sensor that provides the most reliable bark detection available. The Bark control collar uses both vibration and sound sensor (dual-detection) to discriminate each bark from other external noises. A static correction is administered through the contact points only if both the vibration from the vocal chords and the sound from the bark match the same criteria.Second, the bark control collar has a new patent pending temperament learning system design that is effective across many dog breeds and their individual barking behaviors. The temperament learning system contains software that tracks the number of corrections needed to substantially reduce (and in most cases eliminate) the number of nuisance barks. The system has 10 levels of static correction. It begins with low-level corrections, however, if excessive barking continues the correction intensity will increase with each successive bark until the barking stops. Once the dog has learned to reduce the barking, the initial warning corrections are reduced. As a built-in safety feature, if your dog barks 15 times or more within a 1 minute 20 second period, the bark control collar will automatically shut off for 3 minutes.PBC00-10782 Features: # Deluxe Little Dog Bark Control Collar# Ensures your Dog’s Bark is the Only Sound that Will Cause the Correction # Patented Perfect Bark Technology# Automatic Correction Level Adjustment Called Temperament Learning # Ten levels of Light-Touch Correction# Nano Technology-The Smallest Bark Collar Available # Progressive Correction Feature Increases Correction to Next Strongest Level# QuickFit Buckle Provides a Quick Release & Perfect Fit Every Time# Uses Vibration Sensor to Sense for Barking # Not Recommended to use for More tha