[Premium Quality Replacement] Equivalent to PetSafe Model RFA-188 collar batteries. 10-year shelf life. No mercury and Cadmium. [Technical Specs] 3V Lithium Ion Batteries. [Compatibility] 100% compatible with PetSafe RFA-188 batteries; never popping out or falling out from the collars. [Frequency Of Replacement] Battery modules are waterproof and last 1-3 months, depending on use. [Trusted Brand] Made by PET STANDARD for a Better Fit and Better Battery Life [Premium Quality Replacement] Equivalent to PetSafe Model RFA-188 collar batteries. 10-year shelf life. No mercury and Cadmium. [Technical Specs] 3V Lithium Metal Batteries. [Compatibility] 100% compatible with PetSafe RFA-188 batteries; never popping out or falling out from the collars. [Frequency Of Replacement] Battery modules are waterproof and last 1-3 months, depending on use. [Trusted Brand] Made by PET STANDARD for a Better Fit and Better Battery Life [Friendly Customer Service] Please feel free to contact us if you have any questions about our products, we'd like to help you! Compatible Products: => Petsafe Underground Fence Collars - PIG00-10773 Little Dog Deluxe Comfort Fence - PIG00-10778 Comfort-fit Deluxe Little Dog Extra Collar - PIG00-11006 Cat Receiver Collar - PIG00-11007 Deluxe In-Ground Cat Fence System - PIG20-11041 Little Dog In-Ground Fence - PIG19-11042 Little Dog Radio Fence Receiver Collar => Petsafe Underground Fence Collars - PIG22-11868 Little Dog In-Ground Fence - PIG22-11869 Little Dog Extra Fence Collar - PIG22-11849 Cat Containment System - PIG22-11850 Cat Containment System Additional Collar - PCF-1000-20 Smart Cat Fence - PCF-275-19 Cat fence extra receiver => Petsafe Bark Control Collars - PBC00-10782 Deluxe Little-Dog Bark Control Collar - PBC00-11047 Big Dog Bark Control Collar - PBC23-10931 Little Dog Anti Bark Collar - PBC23-10932 Nano Bark Collar => Petsafe Remote Training Collars - PDT00-10867 Little Dog Remote Training Collar