All dogs bark, but some don't know when to stop. If your dog's barking is becoming a nuisance, this may be the solution you're looking for. The PetSafe® Big Dog Deluxe Anti-Bark Collar uses several features designed to shorten the training phase and promote good behaviour. The Deluxe Anti-Bark Collar uses both vibration and sound sensors (dual-detection) to discriminate your dog's bark from other external noises. An electrical stimulation is administered through the Contact Points only if both vibration from the vocal chords and sound from the bark are detected. Using a patented Temperament Learning System, the Deluxe Anti-Bark Collar tracks the number of stimulation instances needed to substantially reduce (and in most cases eliminate) the number of nuisance barks. Designed for dogs 18 kg and up, it fits neck sizes up to 71 cm and has 10 adjustable levels of progressive static stimulation. The collar includes an automatic safety shut-off: stimulation stops after 80 seconds, is waterproof, and uses 1 x 3 Volt battery (included). The battery usually lasts 3-6 months and there is a low battery indicator. The system includes bark control unit; adjustable nylon collar; battery (PetSafe® RFA-188); and an operating guide.