Expand Training System: The Premier Pet In-Ground Add-A-Dog collar allows you to add unlimited dogs to your in-ground electric fence compatible system with multi-dog pairing compatibility Ensure Pet Safety: A waterproof receiver offers static correction levels plus tone-only mode for flexible training, while an adjustable comfortable nylon strap fits small or large dogs Reliable Durable Design: Built as a rugged constructed and expansion collar, this device includes a low battery indicator, safety time-out, and coverage adjustable up to 5 acres Premier Pet: With a focus on quality and care, Premier Pet provides trusted, easy-to-use pet solutions and friendly support to help pets stay safe, happy, and close to home Over 35 Years of Care: Since 1989, Premier Pet has designed safe, reliable, and innovative products that enrich pets’ lives and strengthen the bond between pets and their families every day