Replacement 3-volt battery for various PetSafe® bark collars and in-ground fence collars. Each battery lasts about 1 month and has a 5 year shelf life. Compatibility Compatible with: Deluxe Little Dog Spray Bark Control Deluxe Big Dog Bark Control Deluxe Little Dog Anti-Bark Collar Deluxe Big Dog Anti-Bark Collar VBC-10 Vibration Bark Control SBC-10 Spray Bark Control Little Dog Deluxe In-Ground Fence™ System Little Dog Add-A-Dog® Extra Receiver Collar Deluxe In-Ground Cat Fence™ System Deluxe In-Ground Cat Fence™ Extra Receiver Collar