Rayovac s advanced manufacturing technologies ensure you receive a powerful consistent battery every time! In fact no battery lasts longer! Rayovac s well-known dial pack features perforations to tear this package down to a portable compact case with a ratcheting dial and a locking back door for added security. Long-lasting Mercury-Free Hearing Aid Battery. 4 Year Freshness Guarantee. Stainless Steel Corrosion Resistance. Made in USA. 24 Packages. Size: 1.063 L x 3.938 W x 4.25 H.