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Multiple models compatibility : The LR521 AG0 379 button battery is suitable for multiple models, including SR521SW, 379A, 179, D379, and SR63, to meet the needs of different devices. Quality materials: Craft with quality materials, ensuring stable voltages output and long service life, reliable power for your equipment. Alkaline battery: use alkaline composition, high energy density and stable voltages output. Button design: Adopting a button design, small size, convenient for replacement and installation. Wide application: suitable for various devices such as watches, calculators, toy, alarm clocks, etc.