This Advanced Premium digital upper arm automatic blood pressure monitor features both patented Irregular Heartbeat Detection (IHD) and Microlife Average Mode (MAM) technology. IHD detects the appearance of an irregular heartbeat during measurement and gives a warning signal with your reading. An irregular heartbeat may indicate or cause cardiovascular disease. Leading cardiologists recommend taking three consecutive blood pressure measurements and averaging them for a more accurate result. This blood pressure monitor features MAM technology which enables a single or average mode measurement - just like the doctor does it! Included with the monitor are a medium arm cuff (for arms 9''-13''), 4 AA batteries, deluxe storage case, quick start guide and instruction book.