"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.Note: Not suitable for chihuahua.Note:Please attention that all our collars are NOT waterproof.Package includes:1x CollarTest Light6V Batteries1 x User's Manual"