This Deluxe In-Ground Fence system was designed to help your cat learn which areas are safe and which are off-limits. As your cat approaches the established boundary, the system delivers a warning tone. If he crosses the boundary, the system delivers a mild static correction through two contact points touching his neck. This will get his attention, but will not harm him. This system provides safe and reliable containment for your cat with tone-only plus 4 levels of correction that allow you to customize the correction level to match your cat's temperament. The collar has a special stretch section that allows you to create the perfect fit for your cat and a battery-life indicator to assure you that the collar is working. Additional notes: