Duracell 21/23 Alkaline 12V Battery (MN21) is a reliable and long-lasting power source for your essential devices. Ideal for key fobs garage door openers security systems and other specialty electronics this battery ensures dependable performance when you need it most. Designed to provide consistent energy it is non-rechargeable and built for extended use. With Duracell s trusted quality you can be confident that your devices will stay powered and ready to go. Keep your important electronics functioning smoothly with Duracell.