Easy-to-read large LCD Display - Easy to read with large LCD display. Simple large numbers makes it more clearly to read. Accurately measure and easy to Operate - Fully automatic wrist blood pressure monitor, you can get the measurements by one-button operation.The professional blood pressure machine can detect accuracy readings. Two users mode &198 reading memory -With the built-in storage function,memory storage with date and time stamp allows you to review the last 99 readings/ double person with a touch of a button, it is the best gift for mom and dad. Fast reading - Less than 1 minute response.The cuff length is about 5.31-7.68 ( 13.5cm-19.5cm ), and the item requests 2 AAA batteries (Batteries are included in package). How to get the most accurate reading: Situating Yourself and the Cuff: 1. Sit still for 5 minutes in a comfortable position. 2.Move any fabric away from your wrist. 3.Put the cuff on snugly with the display on the inside of your wrist. 4.Rest your arm and wrist at heart level. Taking a Reading: 1.Press the "Power" button. 2.Hit the "Start" button. 3.Use an average of 2 readings. 4. Wait a couple of minutes between readings. 5.Wait 5 minutes for more readings if your blood pressure seems high. Working on Accuracy: 1. Avoid drinking caffeine and alcohol 30 minutes before taking a reading. 2. Take your reading before you start smoking for the day. 3. Get your reading before any major physical activity.