Measurement Range 0 - 300mmHg, Pulse Rate 40 - 200/Minute Fuzzy Logic Accuracy: Blood Pressure +/- 3 mmHg, Pulse +/- 5% Inflation/Deflation by Microcontroller Electric Pump System Large LCD Display Date/Time Clock, Systolic and Diastolic Pressure Level in One Display. 128 Automatic Memories Oscillometric Measuring Method Upper Arm Measurement Power Source: "AA" x 4 Batteries(Included)