This 123ink battery is a full replacement for the Verisure CR-2/3AZ battery. The lithium manganese dioxide battery has a voltage of 3V and a capacity of 1,350 mAh. This provides a power capacity of approximately 4 Wh.The battery is suitable for various smoke detectors, sirens and camera detectors from Verisure. When inserting the battery, pay attention to the dimensions of 35mm x 18mm x 17mm. As well as stocking the popular Canon, Brother, Epson and HP brands, amongst others, you can also opt for the 123ink compatible versions. Our own-brand ink cartridges and toner cartridges contain more ink than the original brands and will save you money! Not to mention that all of our 123ink products also come with a 100% lifetime guarantee.