Ortz Dog Shock Bark Collar - Adjustable for Pet Training - Control Your Dog Bark - Made for Big & Small Dogs - Electric Vibration Shock Durable - Red Nylon Electric Anti Bark High-quality Electroinc Anti-Bark Dog Training Shock Collar The bark Terminator is controlled by a microprocessor which distinguishes your dogs bark from other Automatically increases tone and shock stimuli as barking persists Effective on a 5-150 pounds dog and up to 12" neck Low battery consumption. Power by a 6 volt battery size 2/3 AA