Ergonomic cone cuff fits arm: 24 to 36 cm ( 9.4" to 14.2" ) Real Fuzzy Technology Real Fuzzy Technology determines ideal cuff pressure based on one’s systolic blood pressure and arm size. Users no longer need to pre-set the inflation level before measurement. The technology eliminates arm discomfort through unnecessary high inflation settings and also prevents inaccurate readings caused by erroneous cuff inflation levels. Clinically Accurate This blood pressure monitor.