Lifesource blood pressure monitors provide an accurate record of blood pressure over a period of time. This can be a valuable aid in diagnosing and preventing potential health problems. This monitor provides professional accuracy at home, so you can be confident that your readings are consistently correct. Also included is an irregular heartbeat detection that alerts the user and provides and accurate measurement even when an irregular heartbeat occurs. You are able to store up to 30 readings in memory on this monitor so doctor can see results that reflect your true blood pressure taken in the comfort of home. The whole process is quick and easy. Just press the start button, squeeze the bulb and you are on way. Pressure rating indicator visually indicates user's blood pressure category from measurements taken. Displays average reading: calculates the average of the total readings stored in memory a convenient way to get a snapshot of measurements. This box contains: monitor with 30 memory recall, cuff, trilingual instruction manual-english, french, spanish, latex free bulb, quick start card, blood pressure logbook, one aa battery. This box contains a medium cuff. Requires one aa battery, included.