Replacement CR2032 3-volt lithium battery, sold individually. Works with the following meters: Accu-Chek Active, Accu-Chek Advantage, Accu-Chek Aviva Meters, Advance MicroDraw, Advance Intuition, Ascensia Contour, Ascensia Breeze 2, FreeStyle Flash, FreeStyle Freedom, LifeScan Ultra, LifeScan Ultra 2, LifeScan UltraMini, Optium, QuickTek, and EZ Smart.
