Upper Arm Style Electronic Blood Pressure Monitor, which is a microcomputer-intelligent, fully automatic device designed for home health tracking. [1] ( ) Key Specifications & On-Screen IndicatorsThe retail boxes highlight an LCD display showing sample reading values:SYS (Systolic Pressure): 119 mmHg (Top number, indicating pressure when the heart beats).DIA (Diastolic Pressure): 81 mmHg (Middle number, indicating pressure when the heart is at rest).