The PetSafe Lite Rechargeable Bark Control Collar uses several features designed to shorten the training phase and promote good behaviour. 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. An electrical stimulation is administered through the Contact Points on the collar only if both the vibration from the vocal chords and the sound from the bark match the same criteria. Features a compact collar box, ideal for small dogs.