Lithium coin 3-volt battery.Delivers long-lasting, dependable power for your coin-battery-operated items. Work in heart rate or glucose monitors, remotes, keyless entry systems, key fobs, watches, toys and games, and even more specialized devices. These reliable and durable coin lithium batteries are able to withstand a wide range of temperatures (from -22 degrees Farenheit to 140 degrees Farenheit) and can hold power in storage for up to eight years, giving you coin battery power you can depend on. Responsibly designed with zero mercury.