The easy-to-use OMRON 5 Series Digital Upper Arm Blood Pressure Monitor with D-Ring Cuff is powered by OMRON Advanced Accuracy technology, which measures 5 times more data points for more consistent, precise readings. This OMRON-exclusive technology minimizes the impact your breathing and movements will have on your blood pressure reading results, helping to reduce measurement inconsistencies and errors. This monitor can be used with up to 2 users and stores 120 blood pressure readings (60 per user). It also features another OMRON exclusive, an enhanced Irregular Heartbeat Symbol that not only alerts you if an irregular heartbeat was detected during your measurement but also displays the number of irregular heartbeats detected (up to 3). The OMRON Advanced Averaging feature automatically displays the average of up to the last 3 readings taken within the last 10 minutes. To optimize your measurement experience is the OMRON wide-range D-ring cuff included with this monitor. This soft contoured cuff is designed for a more comfortable measurement, so whether you have a standard- or large-sized arm, this cuff fits adult upper arms 9 in. to 17 in. in circumference. This unit operates on 4 AA batteries (included) or AC adapter (not included).