Amazon.com: Duracell A23 MN21 21/23 23A MN21B 12 Volt Duralock Alkaline Batteries x 5 : Health & Household
Duracell Specialty Alkaline MN21 Battery 12V, pack of 2 (A23 / 23A / V23GA / LRV08 / 8LR932) designed for use in remote controls, wireless doorbells and security systems : Amazon.co.uk: Electronics & Photo