"The SportDOG Waterproof Deluxe Collar will never mistake anything for your dog's bark except, well, your dog's bark. The patented design requires both the sound of your dog's bark and a tangible vibration from the bark to occur at the same time before it corrects your dog. Most other anti-bark systems available triggers off one or the other, but not both. Just turn the battery to the ""on"" position, put it on your dog and select the correction range you want. Battery lasts for 6-months. Safe and effective for all dogs over 10 lbs. with necks from 6""-28"". This is the lightest bark collar available at only 1.5 oz."