The SportDOG Waterproof Bark Collar is a lightweight, adjustable collar and is the easiest-to-use bark collar you can find. No programming needed, because it automatically stops barking. Just turn the battery to the "on" position and put it on your dog. 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.