Wrist electronic sphymomanometer, which helps you keep an eye on parents' health.no warranty   Features: Large screen display data clearly visible, favorable for the elderly to see. One button to start the measurement automatically without repeated operation. Dual memory allows parent data to be stored separatedly. Intelligent boosting makes blood pressure measurement comfortable and correct. Reduce the incidence of heart disease adds a safeguard to health. Displays the last three average measurements. Small, easy to carry, pay attention to health anytime, anywhere.   Using Steps: 1. Relax and straighten your wrists 2. Wrap a wristband around the wrist 3. To fasten with a cloth buckle 4. Wait and see the test results 5. Determine fixed integrity   Specifications: Product Name: wrist blood pressure monitor Storage Capacity: 2 people 99 sets measurement data Measuring Position: wrist Measurement of wrist circumference: 13.5~19.5cm Power Supply: DC 3V (2 AA batteries)--NOT Included Measuring Range: blood pressure 0mmHg(0KPa)~280mmHg(37.3kPa), pulse rate 40/min~195/min Allowable Error: Blood pressure ±04kPa(±3mmHg), pulse rate ±5% Item Size: 7.56 * 6.84 * 3.1cm Item Weight: 110g Package Size: 12 * 9.6 * 9cm Package Weight: 280g Warranty: No Warranty