The NIBP cuff is used in combination with patient monitor, blood pressure monitor or a sphygmomanometer. The medical staff connects one end of NIBP Cuff to patient monitor, and the other end is placed on the patient's hand or foot, using the continuous blood pressure measurement principle of photoplethysmography, The blood pressure signal collected by NIBP cuff is transmitted to the host in a real, accurate and timely manner, and after being analyzed and processed by the host, the blood pressure value and heart rate value of the patient are displayed on the screen to achieve the purpose of monitoring.