Energy for the ears: itsPREMIUM PR312 hearing aid batteries are an ideal everyday companion for over-ear and in-ear hearing aids of various styles and models. Made in Germany: itsPREMIUM hearing aid batteries are manufactured with German quality, allowing you to enjoy their performance during outdoor activities and indoors. 3-year shelf life: the zinc-air batteries have a shelf life of 3 years. This means you can create your own backup stash and activate the batteries as needed, as they are as good as new after 3 years of storage. No more surprises! Zinc-air technology: These batteries contain zinc only as an active component, yet they are the most energy-dense batteries among other types. For the best performance and longevity, simply wait 30 seconds to 1 minute after removing the colorful sticker, and you're ready to go! Leak-proof: You can rest assured, as itsPREMIUM hearing aid batteries are leak-proof thanks to their unique composition and high manufacturing quality - safe for you and your hearing aid partner.