DESCRIPTION The PetSafe RFA-67 6V Replacement Battery 2-Pack are replacement batteries that work with the PetSafe bark collar, in-ground and wireless fence receiver collar systems. These batteries are waterproof and last 1-3 months, depending on use. PetSafe brand is here to help you and your pet live happy together. Features: Replacement battery lasts approximately 1-3 months Waterproof batteries Compatible collars: Wireless Pet Containment System Receiver Collar Stay & Play Wireless Fence Replaceable Battery Receiver Collar Deluxe UltraLight Receiver Collar Basic Bark Control Collar Bark Control Collar Compatible fences: Wireless Pet Containment System Stay & Play Wireless Fence with Replaceable Battery Collar Basic In-Ground Fence System In-Ground Fence Includes: 2 RFA-67 6V Replacement Batteries Intended Pet(s): Dogs Compatible With: UL-275 and UL-250, Receiver , PDBC-300 Deluxe Bark Collar, PBC-102 Standard Bark Collar, PUSB Sonic Bark.