The Petsafe PBC00-11047 Big Dog Bark Control Collar 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 sensors (dual-detection) to discriminate each bark from other external noises.Second, the bark control collar has a new patent pending temperament learning system which contains software that tracks the number of corrections needed to substantially reduce 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 minutesPBC00-11047 Features: # Big Dog Bark Control Collar# Patented Perfect Bark Detection Technology # 10 Levels of Light Touch Correction# Temperament Learning Automatic Correction Level Adjustment # QuickFit Buckle Provides a Quick Release & Perfect Fit every Time# Adjustable Collar for Neck Sizes up to 34″ # Durable, Waterproof Receiver Collar# Two Color LED For Good/Low Battery Indicators # On/Off Position for Longer Battery LifeThe PBC00-11047 Includes: # (1) PBC00-11047 Bark Collar# (1) RFA-188 battery for collar # (1) ID tag ring# (1) Owner’s manual and training guide