The Terminator first applies a warning tone followed by progressively increasing tone and shock as your dog′s barking persists. If your dog is quiet for 30 seconds or more， the Terminator resets to the mildest correction level. In this way， your pet needs only to experience the higher shock levels a few times before learning that the mild sound and shock stimulus is a warning of stronger corrections to come. Your pet will quickly learn to SHUT UP at the mild correction without having to suffer the more intense stimulus. We have found this technique of progressively increasing sound and shock is not only more humane.It’s more EFFECTIVE in barking habit than conventional shocking bark control collars. The technique is only found on the Terminator made by Electronic Pet Products.Note:Please attention that all our collars are NOT waterproof. Features:Humane uses painless tone followed by shock only if barking persists.Automatically increases tone and shock stimulus as barking persists.Microprocessor controlled.Operates on a standard 6 volt battery.Voice Recognition feature minimizes false triggering.Extremely small and light weight，collar length is 18 inch.Operates on a single long life，6 volt alkaline battery.The biggestvoltage is 13V.when shockingEffective on dogs from 15 pounds to 150 pounds.APSD-Automatic Power Saving Mode.Note:Please note that the button is not for adjusting the volume. The turn button is for adjusting the sensibility of the collar. The led light on the device will light up if the dog barks loud enough. The additional light in the package is for testing the power of the battery.Don’t allow your dog to chew this collar. You should also attempt to minimize scratching or clawing at the casing.This device is made up of plastic and electronic components that are not digestible. Consult your vet if your dog swallows any part of the product.Don’t use the Bark Control Collar with any additional collars， tags， leashes or other items that may cause vibration and trigger false correction.Your dog may wear harness for attaching a leash or tags while using the Bark Control Collar.Don’t leave the Bark Control Collar on for more than 12 consecutive hours.Package includes:2x Collar2x Test Light2x 6V Batteries (retail box not included)