With this hearing aid battery case keychain you will always have spare batteries with you in case your need them. No more fishing around your pockets or purses to find your batteries. The hearing aid battery case keychain is very inexpensive and very convenient. This translucent plastic keychain will hold a pair of any size hearing aid batteries. This keychain hearing aid battery case will also help keep the "sticky tabs" on zinc air batteries intact to help keep the unused batteries last until you need them!