Duracell MN21B2PK Battery, Alkaline, Size 12V, 2pk, 6pk/bx (UPC# 66150) Sold as bx
Amazon.com: Duracell 21/23 12V Alkaline Battery, 1 Count Pack, 21/23 12 Volt Alkaline Battery, Long-Lasting for Key Fobs, Car Alarms, GPS Trackers, and More : Health & Household