This is the Energizer Alkaline Battery A27 12V 2-blister [EN-639333] Energizer alkaline battery, model A27, 12 Volt. 2 Batteries in blister pack. Equivalent models: E27A, V27A, V27PX, V27GA, L728, L828, MN27, G27A, GP27A, WE27A, CA22, UM27A, LR27A, K27A, 27AE, A27S.