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