Because of state-of-the-art fuzzy logic technology, this self-inflating digital sphygmomanometer measures systolic and diastolic blood pressures and heart rate with unexcelled accuracy. Latex-free cuff features self-adjusting D-ring and size guide markings to assure correct fit for optimal accuracy. Extra-large vertical format LCD display is exceptionally easy to read. Other features include last-reading memory and automatic power-off function. Powered by 4 AA alkaline batteries (not included).