The Maxell 381 SR1120SW is a silver oxide coin cell battery that provides a stable output voltage combined with a low self-discharge. That means that the Maxell 381 is a battery perfectly suited towards devices that are in constant use around the house, such as calculators, small electronics, watches, or keyless remote entry systems for cars and homes. It is also ideal for small medical devices like heart-rate monitors, glucometers, and digital thermometers. The Maxell 381 has a shelf life of 5 years, so it will be ready to use the second that you need it.