The Omron® 7 Series Wrist Blood Pressure Monitor (BP652) offers convenience, portability and accuracy. With Heart Guide Technology, the device automatically activates when a patient's wrist is at heart level to ensure an accurate reading. It also detects irregular heartbeats while the patient's blood pressure is being measured. The attached cuff fits wrist sizes 5-1/4 inches to 8-1/2 inches. The monitor comes with 2 "AAA" batteries. There is a five-year warranty.