Extra large cuff is included: come with X-Large cuffs (13"-21") suitable for most arm sizes in the family. No need to buy two bp machine and bp cuff seperately. Updated inflation technology for faster reading for large arms; Adaptive pressure control technology for more comfortable use. Extra Large 6.0 inch Backlit Screen: equiped with customized 6 extra large LCD screen, clear large fonts and High-Def blue backlit screen offers more quickly and comfort blood pressure measurement experience. Eye-friendly for siniors reading at night. One-Touch Operation: One press on start button, disgital blood pressure checker will measure your diastolic, systolic automatically to keep you be well noticed your health. Two-Power Option & 1000 Memories: Support power by batteries or usb cable. Store up to 1000 blood pressure results for 2 users with date and time stamp. Dont have to hand recording any more. Automatically show-off the bp machine after 3 mins to save the battery. More P