Duracell Specialty alkaline N batteries - long-lasting power for your security devices. Duracell Specialty 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 electronics (bike computers, postal scale, desktop clock radio, electronic diary), security (bank card reader), medical devices (glucometers, heart rate monitor), fitness devices (pedometer) and lights.Duracell Specialty alkaline N batteries - long-lasting power for your security devices, Guarantee for 5 years in storage with Duralock Power Preserve™ Technology, Duracell Specialty batteries are available in a variety of sizes