Specialty Batteries: Type - Alkaline Battery; Primary Application - Keyless Entry, Electronic Battery; Cell Style - Cylinder; Voltage - 12V; Terminals - Flat Terminals; Height - 1.122 in(28.5 mm); Diameter - 0.406 in(10.31 mm) Dia; Industry Part Numbers - MN21, A23, KE23A; NEDA Listing - 1811A; IEC Listing - 3LR50; Packaging - Carded; Manufacturer Series - MN21