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Rayovac ProLine Advanced 312A 48 pack (this is 48 batteries) These are fresh new batteries strait from the Manufacturer in Wisconsin. The have a shelf life of 3-4 years. The #1 choice of hearing care professionals. Depend on Rayovac ProLine Advanced Mercury Free zinc air hearing aid batteries to offer reliable, long-lasting performance. Never miss a moment with Rayovac ProLine Advanced Mercury Free batteries. Proline Advanced Mercury Free: The World’s Longest Lasting Rayovac Proline Advanced Mercury Free delivers more battery life than other mercury-free hearing aid batteries. What’s more, it’s environmentally friendly, with consistent power and performance that rivals mercury-containing products on the market today. Made in the USA in Middletown, Wisconsin