The Maxell 379 SR521SW is a silver oxide button cell that is sure to impress. With a stable output voltage and low self-discharge that can handle the high current demands of everyday household items, the Maxell 379 will keep devices running all year long. The Maxell 379 is ideal for keyless remote entry systems for cars and homes, in addition to calculators, small hand-held electronic devices and toys, this silver oxide button battery is perfect for at-home medical devices like heart-rate monitors, glucometers, and digital thermometers. Additionally, the Maxell 379 is able to operate in a variety of temperatures ranging from hot to cold, so that will never be an issue for this battery.