The PetSafe® 3V Replacement Battery is a 3-volt battery designed for certain PetSafe® bark collars and fence collars. Each battery lasts approximately 1 month and has a 5 year shelf life. Features Lasts approximately 1-2 months Compatible with: Little Dog In-Ground Fence™ Little Dog In-Ground Fence™ Receiver Collar In-Ground Cat Fence™ In-Ground Fence™ Receiver Collar for Cats Elite Little Dog Spray Bark Control Collar Vibration Bark Control Collar More Info Save with a Subscription! Make sure your pet tech is always powered and ready. When you subscribe, you’ll get batteries automatically and conveniently delivered right to your door. You’ll also receive free shipping and a 5% discount on the price of the batteries. Easily choose the frequency of your delivery, change your shipment, payment settings or cancel your subscription at any time by logging into your account.