Features: Wrist measurement, not need to take off sleeves, easy to measure, fit and reduce errors caused by wearing. With large LCD display screen for easy reading the data. Voice prompts during the measurement to stop the elderly from being incapable. Equipped with a USB cable, energy once, standby for 30 days. With it, you can measure your bloo d pressure anywhere and anytime. Specifications: Material: ABS Color: Black Applicable Wrist Circumference: 135-195mm / 5.31-7.68in Measurement Range: 0-280mmHg (0-37.33kPa), Pulse rate: (40~185)times/min Accuracy: Preesure: 3mmHg (within0.4kPa), Pulse rate: accuracy 5% Energy: 1 x Lithium cell, 3.7V 300mAh (included) Item Size: 81 * 69 * 31mm Package Weight: 106g Working air pressure: 70-106kPa Transportation and storage barometic pressure: 500-1060hPa Charging po wer: 5V1A Package Size: 100 * 80 * 80mm Package weight: 200g Package List: 1 * Blo od Pressure Monitor 1 * USB Cable 1 * User Manual 1 * Storage Box