How does ViSi Mobile get more accurate blood pressure readings? It is a patient-worn, portable, battery-operated, physiological monitoring device to measure arterial blood pressure (systolic, diastolic, and MAP) using a Cuff. Measurements may be initiated manually (one at a time), automatically at selectable predefined intervals of 5, 10, 15, 30, 60, 90, and 120 minutes or continuously.