Inclusion criteria:  This plan excludes those under 22 years of age, pregnant, and severe cardiovascular and neurological diseases. It is estimated that about 120 subjects will be admitted and divided into three groups:  (1.1) The first group-High Range: At least 17 subjects over 22 years old with systolic blood pressure exceeding 140mmHg and diastolic blood pressure exceeding 90mmHg.  (1.2) The second group-Middle Range: at least 17 subjects over 22 years old with systolic blood pressure ranging from 110mmHg to 140mmHg and diastolic blood pressure ranging from 60mmHg to 90mmHg.  (1.3) The third group-Low Range: at least 17 subjects over 22 years old with systolic blood pressure lower than 110mmHg and diastolic blood pressure lower than 60mmHg.  Exclusion criteria:  (2.1) People younger than 22 years old. (2.2) pregnancy. (2.3) the following conditions:  Arrhythmia Prior heart failure or heart attack Peripheral vascular disease or compromised circulation Valvular disease (diseases concerning the aortic valve) Cardiomyopathy Other known cardiovascular disease End-stage Renal Disease (ESRD) Diabetes Neurological disorder (for example, tremors) Clotting disorder or you are taking prescribed blood thinners Tattoo(s) on the wrist where you will wear the ASUS VivoWatch SP