100% brand new and high quality!Introduction：The Anti-Bark collar PET853 stops barking with progressively increasing sound and shock which is controlled by a microprocessor distinguishing your dog\'s bark from other environmental noises and automatically delivers sound and shock after each bark.Principles of operation:At the first bark， PET853 Anti-bark Collar applies a short warning tone. If a second bark occurs within thirty seconds， a more intense tone is sounded. From the third bark， a more intense tone is sounded along with a short， mild shock.This pattern is repeated through 7 correction levels. The first two levels are only with progressively warning tone. If your dog continues to bark through the rest five levels， the more intense sound and shock are applies after each bark until your pet stops for thirty seconds. And then Anti-bark collar will automatically resets to the first \"tone\" level of correction. To protect the dog， if the continuous stimulus reaches the 7levels， then the collar will stop working for 1 minute.Color: BlackDurable and safetyNote:Do not allow your dog to chew this collar or any part of this productWith instructions inDo not include battery