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. Arrhythmia Detecting & One-Touch Operation: One press on start button, disgital blood pressure checker will measure your diastolic, systolic and heart rate automatically. Irregular heartrate alert as well 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. Don???t have to hand recording any more. Automatically show-off the bp machine after 3 mins to save the battery. More Pratical Accessories & 12-Month Warranty: What is included- 1x blood pressure machine, 1x standard size cuff, 1x extra large cuff, 1x nylon carry bag, 1x type-c cable, 4x aaa batteries, 1x user manual. Perfect for monitoring blood pressure home use or at travel. One year warranty for all respected customers with 24/7 after-sale service. If you have problems with our Blood Pressure Monitor, please contact us directly. Why data result different: Blood pressure monitor varies occasionally affected by many factors such as stress, measuring time, the way to wrap the cuff. It is common and you can detect it three times at the same time. Please avoiding any factors that may affect reading results before use the blood pressure monitor.