The special 1220 lithium button cells from Duracell are batteries you can rely on. They are dependable and long-lasting, commonly used to power medical devices such as blood glucose meters and heart rate monitors, safety-related devices like card readers, as well as other electronic devices like watches, alarm clocks, and pedometers. Duralock technology ensures that battery performance is maintained for up to 10 years during storage. Long-lasting energy is guaranteed. The right size is easy to find. Duralock. Packaging with a child-friendly design. 1 piece.