Coppertop batteries have been engineered to deliver just the right level of power for most of your household needs. Plus, guaranteed fresh for 7 years. Many of the devices you use in your home are powered most efficiently by Duracell Coppertop batteries, including: Toys, Clocks and Radios, Remote Controls, Smoke Alarms, and Flashlights; Now 24 batteries for the price of 20; Guaranteed Fresh for 7 years; Mercury Free; Made in the USA