DURACELL E23DURB2 12V Batteries Pack of 2 MN21\n- Duracell MN21/23A batteries are a pack of 2, 12V micro alkaline batteries.- These alkaline batteries give your devices such as remote control car key fobs, garage door remotes, electronic cigarette lighters, wireless PIRs, alarm systems and more a super charged performance for a long lasting life.- The Duralock technology saves the battery charge for a maximum of 5 years in storage.