Zero-Mercury Alkaline Battery, Miniature, Series: A544, Chemical System: Manganese Dioxide, 6 V Nominal, 178 mAh Nominal, 3.6 V Discharge Cut-Off, 0.16 mA, 30 kohm Internal Impedance, Metal Case, 0.512 in Diameter, 0.992 in Length, ANSI/NEDA 1414A, IEC 4LR44, For Photo/Electronic Books, Glucose Monitors, Keyless Entry