The first smart health bracelet that has passed the national second-class medical device certification for blood oxygen saturation and medical-grade blood oxygen wearable device (CFDA). Test content: blood oxygen test (Class II medical device), static heart rate test (medical grade), sleep quality test, sleep disordered breathing test, cardiac HRV test, exercise heart rate test. Scientific ECG health management. The smart terminal downloads the APP "Racefit pro" to connect the device to obtain health reports and health value-added services.