Are you looking for a replacement battery for your PetSafe RFA-67 system? This two pack of 6 volt lithium metal batteries is just what you need! These batteries are compatible with PetSafe bark collar, in-ground and wireless fence receiver collar systems. Each battery module is waterproof and can last 1-3 months, depending on your pet's usage. These batteries are a great way to keep your pet safe and secure while still being able to enjoy their outdoor activities.