About this item Specification Material: ABS Size: 7.5X6.5X3CM Bracelet: 23CM Box: 9.5X9X7CM Parameters: Storage Temperature: -20 ℃ ~ 50 ℃ Storage Humidity: 15% ~ 90% Working Temperature: 10 ℃ ~ 40 ℃ Operating Humidity: 40% to 85% Display Mode: LCD digital display Measurement Method: pulse scanning / oscillometric Measurement Range: hypertension / hypotension: 20mmHg ~ 280mmHg Pulse: (40 ~ 200) times / minute Accuracy: ± 3mmHg (± 0.4kPa) Pulse: within ± 3% of the reading Voltage: 3V Package Includes 1X Blood Pressure Monitor 1X English Manual Note: - Please allow a slight dimension difference due to manual measurement. - Please consider the actual sizes in the listing as the pictures are usually enlarged to show details. - Due to different production batches, product details may be slightly different. If you mind the difference, please buy it carefully. - Due to the difference in light and screen, the item's color may be slightly different from the pictures. Thank you for your understanding. Brand:Willstar It can measure the systolic and diastolic pressure and pulse in seconds. With the adjustable cuff from 22 to 32 cm, it fits the most common arm circumferences Easy to Read: With a large LCD screen, it measures blood pressure and heart rate quickly and is easy to read Irregular Heartbeat Indication: When it detects an irregular heartbeat, it will be indicated and warned of this abnormal signal immediately Large Cuff Size Fits 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 by an AC adapter (not included). Convenient to use and carry anywhere if used with AA batteries