Designed for stubborn and hard-to-train pets - highest intensity level available. 4 adjustable static correction levels plus tone with vibration only mode. Ideal for training hearing-impaired dogs. Includes 500' of wire and 50 boundary flags. Will cover up to 10 acres - additional wire and flag kits required. Waterproof receiver with low battery indicator. Works with multiple pets, additional receiver collars required (SKU 812124). Operating and training guide included.