High Tech Pet Products Replacement B-3V1A Battery 2-Pack for HTP Collars keeps your household running just as it should. For use with the High Tech Pet Microsonic collar, these batteries last for about three months—which equals countless trips outside before you need to replace them again. The special design also protects against damage in case they are installed incorrectly, and when used with the collar they will keep on going even in heavy rain and snow. It’s the reliable use that your pet deserves and that you require!