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). Duracell is the world’s number one consumer battery company by market share and the leading manufacturer of high performance alkaline batteries, speciality cells and rechargeables. Since the launch of the brand in 1965, it has grown to become a global consumer icon, known for its commitment to quality, reliability and innovation.