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
Duracell A23 12 Volt Alkaline Security Battery (23A, MN21, LRV08). 2 Pack - Go Green Batteries