The product is a 10 pack of 4 GN Resound hearing aid batteries, model GN-312-4A. These brown batteries have an expiration date of 04/2026 and are designed for both ears. They are replaceable and feature digital sound processing, suitable for individuals with hearing aids who require reliable and long-lasting power sources for optimal function. Made in the United States, these batteries are compatible with GN Resound hearing aids, ensuring a seamless and efficient listening experience. 40 batteries total in box. please see attached photos for better detail of actual item you will receive.