Features1 x CR2 battery3 VLithiumIdeal for a range of devices and accessoriesHigh-purity lithium for long lasting powerThe Duracell High Power Ultra Lithium CR2 Battery is made with high-purity lithium for long-lasting power guaranteed. Results may vary by device and usage patterns. Ideal for your smart home devices (sensors, keyless locks, smoke detectors), photo flash, flashlights, bike accessories and electronic dog collars. They have up to 10 years of in-storage guarantee with Duralock Power Preserve technology so you can be confident these lithium batteries will be ready when you need them.