The revolutionary e-sphyg is to Aneroid Sphygmomanometer blood pressure what the quartz watch was to timepieces. Virtually indestructible digital manometer with large easy to read backlit LCD. Water resistant for use in the field. Auto off feature. Systolic assist function alerts the operator to the onset of systolic. Displays heart rate after measurement complete. Deflation rate display promotes proper technique. ADCUFF inflation system helps prevent miscuffing. 1500 measurements with backlit on. Lifetime warranty on manometer. Requires stethoscope (not included).