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
Amazon.com: 5 X 2 Energizer A23 21/23 23A MN21 GP23 12v Alkaline Garage Door Opener 10 Batteries : Health & Household
Best Buy: Duracell 12V Alkaline Battery MN21BPK
Adorama 23A 12v Alkaline Battery for Remotes. Equivalent of DURACELL MN21 - Newegg.com
Energizer Specialty A23 Alkaline 23a Security Batteries (2-Pack) in the Device Replacement Batteries department at Lowes.com
Duracell 12 Volt Alkaline Alarm Remote Battery MN21 / A23 2 Pack – Batteries and Butter
Amazon.com: Duracell 21/23 12V Alkaline Battery, 4 Count Pack, 21/23 12 Volt Alkaline Battery, Long-Lasting for Key Fobs, Car Alarms, GPS Trackers, and More : Health & Household