Power up your smoke alarm with these two Duracell 9V PP3 Plus Power Batteries. These batteries are designed to provide long-lasting power and are compatible with LR22 and MN1604 models. The alkaline chemical-composite ensures reliable and efficient performance, while the expiry date of 2027 indicates that you can enjoy worry-free power for years to come. These batteries are perfect for multipurpose use and are a must-have for any home or office. With a unit quantity of 2, you can rest assured that you will always have a spare battery on hand. Trust in the Duracell brand and enjoy the peace of mind that comes with knowing your smoke alarm is always powered up and ready to go.