The Digital Filter Technology uses a sensor to detect and isolate only the essential pulse oscillation. It helps eliminate other noise factors, leading to quick and reliable measurement capability. This also helps avoid over-tightening of the cuff on the wrist. Readings above 139 on Systolic or 89 Diastolic will automatically flash on the LCD screen. An automatic memory feature allows you to capture 90 readings and save them to track the readings over time. With just the touch of one button, the monitor auto inflates for quick, easy measurements. Large LCD Display. The large LCD display panel shows both blood pressure readings and pulse rate displayed simultaneously. Batteries Included. Our blood pressure monitor comes with four AA Alkaline batteries. Digital Filter Technology Yes. Flash Warning System Yes. Memory 90 readings. One-Touch Auto Inflate Yes. Method of Measurement Oscillometric System. Measurement Range Pressure, 0-280mmHg; Pulse Rate, 30-160 pulse/min. Measurement Accuracy Blood Pressure, +/3 mmHg; Pulse Rate, +/5%. Display Type Digital LCD. Large LCD Display Yes. Blood Pressure/Pulse Rate Display Yes.