uracell has always been known for its industry leading quality in manufacturing, and the Duracell MN21 key fob battery benefits from this level of quality. Duracell MN21 can fit many electronic key fobs, such as garage door openers, so the Duracell MN21 battery is a highly flexible battery that can be used in a large amount of applications.

The MN21 batteries are extensively used in security applications, such as alarm systems, motion detectors, wireless PIRs, and magnetic reed switches. Users that have used the Duracell MN21 key fob battery in garage door openers have reported that it keeps a larger range, for a longer amount of time when compared to other batteries.