1.Small size and light weight.2.This is the newest anti-bark collar with the most intelligent system.3.Controlled by a microprocessor which distinguishes your dog's bark from other environmental noises and automatically delivers ultrasonic and/or static shock after each bark.4.The collar can effectively and humanely stops barking when it is worn on dogs.5.An adjustable collar strap is suitable for most small and medium dogs.6.Low battery consumption.Specifications:1.Usage: Training !#!amp!*! behaviour aids2.Powered by: 1 * battery( included)3.Collar material: Nylon4.Adjustable collar strap length: Approx.27cm-48cm5.Bark controller size:6.7 * 3.5 * 2.6cmPackage include1 * Bark controller1 * Collar strap1 * Test light1 * Special screwdriver1 * User manual