About this item Specification Materials: ABS Size: 7.5X6.5X3CM Wristband: 23CM Box: 9.5X9X7CM Parameters: Storage temperature: -20 ~ 50 Storage humidity: 15% ~ 90% Working temperature: 10 ~ 40 Operating humidity: 10 ~ 40 Operating humidity: 10 ~ 40 Operating humidity: 10 ~ 40 Operating humidity: 10 ~ 40 Operating humidity: 10 ~ 40 Operating humidity: 10 ~ 40 Operating humidity: 10 ~ 40 Notice: - Please allow small dimensional difference due to manual measurement. - Consider the actual sizes in the listing, as the images are generally enlarged to show detail. - Due to different producing batches, product details may be slightly different. If you notice the difference, you can buy it carefully. - Due to the difference in light and screen, the color of the item may be slightly different from the pictures. Thank you for your understanding. It can measure systolic and diastolic pressure and heart rate 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 screen, it measures blood pressure and heart rate quickly, and is easy to read Irregular heart rate indication: when it detects irregular heartbeat, it will be indicated and alerted about this abnormal signal immediately The large size of the bracelet fits the arm circumferences 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 supplied). Convenient to use and carry anywhere if used with AA batteries