Don't let their small size fool you. Energizer 2430 Lithium Coin 3-Volt Battery delivers big time on long-lasting, dependable power for your coin-battery-operated items. From heart rate or glucose monitors, to remotes, keyless entry systems, key fobs, watches, toys & games, & even more specialized devices, they are compatible with the devices that fit your life, so you can keep going. These reliable & durable Energizer Coin Lithium Batteries are able to withstand a wide range of temperatures (from -22 to 140F) & can hold power in storage for up to eight years, giving you coin battery power you can depend on. With zero mercury & child-resistant safety packaging to keep your little one safe, it's easy to see why Energizer Lithium Coin Batteries are the right choice for your specialty devices. Battery Type: Lithium Coin; Battery Size: 2430; for Use With: Calculators; Watches; Battery Capacity: 280 mAh.