He may be stubborn, but that doesn’t mean he can’t be kept safe and secure. To help manage your strong-willed dog, this In-Ground Fence™ system and Receiver Collar comes equipped with five adjustable levels of electrical stimulation, including a tone-only plus vibration mode. The adjustable Receiver Collar is especially designed for hard-to-train dogs of every size. Wire Calculator Features Add an unlimited number of pets with additional in-ground Add-A-Dog® Receiver Collars# Automatic Shut Off: Over Stimulation Protection: Stimulation stops after 30 seconds Collar uses 1 x 9 Volt battery Battery usually lasts 1-3 months Collar Size: Fits neck sizes 15 - 71 cm Containment Area: Covers up to 13 ares (1/3 acre/0.13 hectares) with included boundary wire Expandable System: Expandable up to 400 ares/10 acres/4 hectares (additional wire and flags required) Waterproof Receiver Collar Safe, Effective, Trusted - Our static collars are part of our ongoing mission to provide the best tools, education and support for pet parents seeking safe, successful, expert-recommended options to meet each dog’s unique training needs