Duracell Specialty alkaline MN21 batteries - long lasting power guaranteed for your devices. Duracell Specialty batteries have up to 5 years of in-storage guarantee so you can be confident these alkaline batteries will be ready when you need them. They are suitable for use in wireless remote controls, wireless doorbells and security systems (alarms, locators). Features and benefits: Duracell Specialty alkaline MN21 batteries - long-lasting power guaranteed Guarantee for 5 years in storage Duracell Specialty batteries are available in a variety of sizes: J, N, AAAA, MN21, MN11, MN30 Duracell Specialty alkaline MN21 batteries are suitable for use in wireless remote controls, wireless doorbells and security systems (alarms, locators)