Specification: Cuff adjustable rage: 22 to 32 cm(8.7 "to 12.6") Power supply: 4 AA batteries (not included) Feature: Advantage: The device can distinguish between two different users, with which the capacity is up to 99 measurements for each person, with storage also of the date and time for each measurement. Portable, practical, sustainable Desktop design: it is durable,built for the home, in the office, for clinical use or to be used on travel. Package Including: blood pressure meter1 Wrist strap1 Manual 1 Storage bag1 Notice: Please allow slight dimension difference due to manual measurement. Please consider the actual sizes in the listing as the pictures are generally enlarged to show detail. Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. Due to the light and screen difference, the item's color may be slightly different from the pictures. Thanks for your understanding. Brand:Willstar It can measure the systolic and diastolic pressure and the pulse in seconds. With the adjustable cuff from 22 to 32 cm it is suitable for the most frequent arm measurements Easy to read: with a large LCD display, it measures blood pressure and heart rate quickly, and is easy to read Irregular heart rate indication: once it detects an irregular heartbeat, it will be indicated and alerted to this abnormal signal instantly The large size of the bracelet fits the circumferences of the arm from 22 to 32 cm (8.7 "to 12.6") The blood pressure monitor is powered by 4 AA batteries (not included), or with an AC adapter (not included). Practical to use and carry anywhere if used with AA batteries