Clinically Proven Accuracy: This automatic digital monitor has been Clinically Tested for blood pressure measurement and awarded the highest rating for accuracy (Rated AA by BIHS) Simple Operation: Easy-to-read numbers; Large buttons with one-touch to start/stop and view measurements Premium Wide-Range Cuff: Contoured cuff is easier to put on and features a soft outer fabric; Gentle+ Technology uses less pressure in less time; Upper arm cuff fits most M L (8.7 16.5 in / 22 42 cm); XL cuff (sold separately) fits