USB Rechargeable Portable Design - yuwell wrist blood pressure machine Built-in 500 mAh battery, it can be used continuously for 250 times or 90 days after fully charged, No need to replace the battery, saving money. Also, it is very easy to carry - lightweight and small design make convenient to take it with you anywhere. Comfortable and Adjustable Wrist Cuff - Our adjustable wrist cuff comfortably fits adult arm sizes from 5.32 to 7.68 inches, allowing for a snug fit on almost everyone. Intelligent pressurization technology can reduces discomfort and tension caused by excessively inflation Accuracy and position Detection - yuwell wrist blood pressure monitors come with Heart Zone Guidance, which helps to guide your wrist to the proper position (at heart level). Fully automatic blood pressure checker has advanced measuring techniques, to provide you the most accurate reading Voice Broadcast and 74 Sets Memory - The American assent voice broadcast and the large LCD screen sh