2-pack of RFA-67 6-volt batteries. Replacement batteries for PetSafe in-ground and wireless fence receiver collars and bark collars. Each battery lasts 1-3 months. For PetSafe fence, bark and training collars. Works with PIF-275 models. Compatible with many PetSafe Containment, Bark Control, and Remote Trainer collars: * Deluxe Bark Control Collar (PDBC-300-20) * UltraLight Ultrasonic Bark Control (PUSB-150-19) * Bark Control Collar (PBC19-10765) * In-Ground Fence (PRF-3004W-20) * In-Ground Fence (PIG00-13661) * Ultralight Add-A-Dog Extra Receiver Collar (PIG19-10761) * Deluxe Ultralight Add-A-Dog Extra Receiver Collar (PIG19-10764) * Wireless Pet Containment System (PIF-300-21) * Wireless Pet Containment System Add-A-Dog Extra Receiver Collar (PWF19-10762)