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NO HEARING AID BATTERY LASTS LONGER. Rayovac Proline offers the world's longest lasting hearing aid batteries (based on ANSI/IEC testing). That means fewer total batteries over the ************************************************************* of your hearing aids, and less frequent *************************************************************. ACTIVE CORE TECHNOLOGY. Provides unparalleled power on demand, longer lasting performance, and increased durability. CHILD-RESISTANT PACKAGING. Our child-resistant packaging keeps children & infants safe by requiring scissors to cut open the plastic dial. MERCURY-FREE. Our Zinc Air batteries are mercury-free, making them an environmentally friendly choice. LONG BATTERY TABS. Our long battery tabs make it easy to handle the batteries and are color-coded for easy identification.