Beurer BC 21 Talking Wrist Blood Pressure Monitor not only quickly and easily measures your pulse and blood pressure, but reads measurements out loud. Other helpful features include a risk indicator and arrhythmia detection, which classify readings and alert users to abnormal heart rhythms, respectively. This sophisticated medical device is also able to calculate your average blood pressure reading, across 60 recorded readings, as well as the average for the preceding 7 days' morning and evening readings. Made for wrist circumferences of 14cm-19.5cm. Switches off automatically.