The 5 Series provides these 5 benefits: Two user mode allows two different users to monitor and track their readings separately in the stored memory. Advanced averaging: Exclusive technology automatically displays the average of up to the last 3 readings taken within the last 10 minutes. Irregular heartbeat detector: This monitor can detect irregular heartbeats while your blood pressure is being measured. If an irregular heartbeat is detected, an indicator icon will appear alerting you so you can consult with your medical professional. Hypertension indicator alerts you if your blood pressure reading exceeds the American Heart Association guideline for normal home blood pressure levels. 60 memory storage: 30 memory storage for each person (60 total) with date and time stamp allows you to review the last 30 readings with the touch of a button. Clinically proven accurate. Contains: 1 digital automatic blood pressure monitor, 1 contoured arm cuff (fits arms 9-13 inches in circumference), 1 illustrated English/Spanish instruction manual, 1 quick start guide, 4 AA batteries.