Duracell Speciality alkaline MN21 batteries – long lasting power for your devices. Duracell Speciality batteries have up to 5 years of in-storage guarantee with Duralock Power Preserve technology so you can be confident these alkaline batteries will be ready when you need them. They are designed for use in Wireless remote controls, wireless doorbells, security systems (alarms, locators).Pack qty[tab]2[br]Type[tab]MN21[br]Voltage[tab]12V