Easy, one-button design with error protection provides accurate, reliable readings. "Fuzzy logic" circuitry for automatic, customized inflation levels. Digital readout of systolic pressure, diastolic pressure and pulse rate. 8-bit processor for precise results. Memory stores results. Placement: Upper Arm Size Group: Adult Large, Fits Arms 30-38 cm Power Sources: 4 AA Included.MIIMDS2001LA. MDS2001LA. Medline Medline Automatic Digital Upper Arm Blood Pressure Monitor.