Includes: Panasonic Blood Pressure Monitor EW3106W 4 AA Alkaline batteries. Panasonic EW3106W Upper Arm Blood Pressure Monitor provides flash warning system for hypertensive readings. Readings above 139 on Systolic or 89 Diastolic will automatically flash on the LCD screen. Digital Filter Technology detects and isolates only essential pulse oscillation helping eliminate other noise factors for quick and reliable measurement and avoiding over-tightening of the cuff on the wrist. Automatic memory feature allows you to capture 21 readings and save them to track the readings over time. Just the touch of one button inflates monitor for quick easy measurements. Large LCD display panel shows both blood pressure readings and pulse rate displayed simultaneously. Measurement Range: Pressure: 0-280mmHg; Pulse Rate: 30-160 pulse/min. Measurement Accuracy: Blood Pressure: +/- 3 mmHg; Pulse Rate: +/- 5%. Circumference Range: Approx. 7.75 to 13.25 inches (20cm to 34cm). Power Source: 4 AA Batteries alkaline included rechargeables purchased separately. Blood pressure monitor dimensions (H x W x D) 2.67 x 4.33 x 5.91 inches. Panasonic EW3106W weighs 10.1 oz.