The Petsafe RFA-67D-11 RFA-67 6 Volt Battery Module 2 Pack is a high-quality replacement battery designed for dogs that are used in electronic fences. With a waterproof design, this battery module has a long-lasting power supply that can last 1-3 months depending on usage. Perfect for pet owners looking to replace their current battery module, this product from PetSafe ensures the safety and security of your furry friends.