The sensor measures the pressure in the air pillow wrapped on the tested person'sarm. Heartbeats affect the blood pressure.That is the reason for the difference between the systolic and diastolic pressure of the tested person. The sensor has three ranges; The average pressure in the air pillow in mm/Hg, The pressure beats with no units, The sum of the two above signals. The NeuLog software extracts the following from the blood pressure graph: The Systolic blood pressure, The Diastolic blood pressure,The MAP blood pressure, The heart beat rate. Experiment Duration: 1 second to 31 days.