The three-digit readout is on an easy-to-read LCD screen It will show your diastolic systolic and heart rate readings all at once The memory on board will hold 85 readings to help trace your trends for your Doctor. 2 AAA batteries will power the monitor for up to 250 readings Take this portable monitor with you everywhere for quick readings at work exercising or vacations It will handle readings wherever you are 2 AAA battteries required.