Innotek Basic In-Ground Pet Fencing System, SD-2000 Effective, affordable fence keeps your dog safe and secure in your yard Complete system is for up to 1/3 acre but can cover up to 5 acres with purchase of additional wire and flag kits. Perfect for dogs of all ages, sizes, and breeds Replaceable-battery system installs easily Includes wire, training flags, contact points, collar, receiver, and training DVD