PetSafe 6 Volt Lithium Replacement Batteries (2-pack) is compatible with PetSafe bark control collars, as well as wireless and in-ground fence receiver systems. These batteries are waterproof and will last between 1-3 months, depending on how they're used.

Features:

• Includes two 6-volt RFA-67 lithium metal batteries
• Compatible with PetSafe bark control collars, wireless and in-ground fence receiver systems
• Batteries are waterproof and long-lasting