Premier Anti-Bark Collar Gentle Spray Refill Battery 1-pack of a 6-volt alkaline battery Replacement battery for the PetSafe Elite Big Dog Spray Bark Control and the PetSafe Comfort-Fit Big Dog Spray Bark Control collars Battery has a 5-year shelf life and lasts up to 1-2 months 1-pack of battery Call, chat or email the PetSafe US-based customer care specialists six days a week