Rayovac Extra Hearing Aid 312 Size batteries Zinc air 30 – 120 cells DetailsZinc-air batteries provide clear tones, less volume level adjustments. Easy-to-open packaging. Thicker, larger and more robust cards provide improved handling. Easy to hold, replace and remove.Long Lasting Battery improved cell design and formulation deliver more powerMade in USA Made in the USA with US and Global Parts++ Rayovac has been manufacturing hearing aid batteries in WI for over 50 years. Through continuous investments and improvements, Rayovac is able to deliver new, innovative battery technology that features peak performance in today’s devices.Long Lasting, Guaranteed!† These batteries come with our four-year freshness guarantee so you can be confident in your purchase. FOR BULK Quantities please contact us through eBay. We offer competitive pricing for bigger quantities. Shipping Policy: We ship items within 1-2 Business days after receiving payment. You should get your item within 3-5 days. Please contact us after 7-10 days if you have not received your item so we can ship it again. Customer Service & Return: If you are not happy with the product then you can return the item for full refund within 14 days after receiving the item. We always appreciate positive feedback if you are happy with the product and our service. Please contact us for any issue or if you are not happy before leaving any negative or neutral feedback. We will do our best to resolve the issue to make you happy.