The Omron HEM7121 Standard Upper-Arm Blood Pressure Monitor is easy to use and features 30 reading memory and also irregular heartbeat, hypertension and body movement indicators.Automatically applies the right amount of pressure for accurate and more comfortable measurements. If an irregular heartbeat is detected, an indicator icon will appear alerting the user to consult with a medical professional. Alerts user if any body movement has occurred during the blood pressure reading. Alerts you if your blood pressure reading exceeds internationally recognised guidelines for normal home blood pressure levels. Exclusive technology displays the average of the last 2 or 3 readings taken within a 10 minute span. Storage case included – Power source – 4 x aa batteries. Refer to product manual provided on the packaging Store below 30C in a dry place away from sunlight. Always read & follow the instructions for use & health warnings. For people with high blood pressure. Consult your doctor to evaluate the readings. Check your device periodically for accuracy.