Product specifications. 1. Measures the wrist joint 2. Easy to operate 3. Automatic measurement 4. Memory storage 2*99 sets 5. Sequential query of memory data 6. LED high definition display 7. 1 minute automatic shutdown without operation 8. Accuracy: blood pressure 3% heart rate 5% 9. Measurement range: blood pressure 0-280mmHg pulse rate 40-199 times/min 10. English voice Multi-User Memory, Saving Time Saves Lives Blood pressure monitor wrist cuff maintains a full numeric spectrum of your and your families blood pressure so you dont waste time recalling the critical information emergency professionals need to make that split-second, life altering decision.Tips on how to get accurate results 1. Read at the same time every day, using the same wrist. 2. Place your feet on the floor without crossing your feet. 3. Follow the instructions to place the BP cuff in the correct position on the wrist, over the bone. The screen should be on the side of the palm. 4. Please keep quiet, relax your body and don't speak during the measurement. When measuring continuously, span 4-5 minutes. 5. Do not touch the main unit and wristband during measurement. 6. Avoid drinking alcohol or coffee, eating, drinking, smoking, exercising and bathing within 30 minutes before the measurement for more accurate data. Specifications Material: ABS+LED digital display Color: Black Applicable Wrist Circumference: 4.92-8.46in Memory: 2 x 120 groups Average Function: Last 3 groups average measuring value