Duracell-MN21-Keyfob-Battery-Duracell-MN21B2-P-Duracell-Alkaline-Manganese-Dioxide-batteries-are-the-popular-choice-for-most-consumers-industrial-&-military-applications-where-an-economical-general-purpose-battery-is-required-Advantages-include-high-energy-output-reliability-long-shelf-life-&-superior-low-temperature-performance-P-Duracell-5000394203969-MN21B2-12V-Keyfob-Battery-Pack-of-2-