The Beurer BC57 is a wrist blood pressure monitor designed for convenient and accurate blood pressure measurements. Here are some key features of the BC57:

1. Automatic Measurement: The BC57 provides fully automatic blood pressure and pulse measurement.
2. Wrist Cuff: It comes with a cuff suitable for wrist circumferences ranging from 14 to 19.5 cm.
3. Clear Display: The device has an easy-to-read display.
4. Arrhythmia Detection: It warns you in case of possible heart rhythm disturbances.
5. Memory Storage: The BC57 has two user memories, storing 60 measured values each. It also calculates the average value of all stored measurements and morning/evening blood pressure for the last 7 days.
6. Date and Time: Displays the date and time.
7. Automatic Switch-Off: The monitor automatically turns off to save power.
8. Application Error Signal: Alerts you in case of application errors.
9. Battery Indicator: Requires 2 x 1.5V AAA batteries 
10. Compact and Portable: The BC57 is compact (78 x 60 x 23 mm) and weighs approximately 96 g (without batteries, with cuff).