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.

CR2032 3Volt Lithium Replacement Battery