Semi-Automatic Digital Blood Pressure Monitor ? Measuring Range: Pressure 30-250mmHg Pulse: 40-200/minute ? Measuring Accuracy: Pressure: 3mmHg Pulse: +5% ? Last reading memory ? Inflation: By Pumping Ball ? Deflation: Automatic by Valve ? Pressure Detection: Semiconductor Pressure Sensor ? Power Source: AAｘ4 Battery ? Battery Life: Approximately 1500 times of measurements ? Battery Management: 1-min, power-off/Low battery indicator