The Rayovac Size 312 Loud N Clear Hearing Batteries come in a pack of 6 count (60) batteries total) with an expiration date of January 2029. These batteries are designed for Behind the Ear (BTE) hearing aids and are suitable for both ears. Manufactured by Rayovac in the United States, these hearing aid batteries are replaceable and feature an analog sound processing capability. With a clear color and no manufacturer warranty, these batteries are a reliable and long-lasting power source for daily living aids in the medical and mobility department.