"Requires only a .7 mL blood sample and provides results in just seven seconds. Faster and easier to use; does not require coding or a code chip. Talking monitor has a built-in speaker that provides audible messages and results to help user obtain accurate results in English and Spanish. Store up to 450 results with time and date. Results can be downloaded to a computer. Provides 7, 14, 21, 28, 60 and 90 day averages. Alternate site testing and requires two ""AAA"" batteries."