To help manage your strong-willed pal, this in-ground fence comes equipped with five adjustable levels of correction, including a tone-only plus vibration mode. The adjustable collar is especially designed for hard-to-train dogs. Relax, help is on the way! Features: Designed for stubborn and hard-to-train pets - highest intensity level available Four adjustable static correction levels plus tone with vibration only mode Ideal for training hearing-impaired dogs Includes 500 ft of 14g wire and 50 boundary flags (covers up to 1/3 of an acre) Covers up to 10 acres (additional wire and flag kits required) Waterproof receiver with low-battery indicator Works with multiple pets (additional receiver collars required) Operating and training guide included Includes surge protector