Evaluate the Accuracy of a COPD Screening Algorithm Model

Inclusion Criteria: 1. Over the age of 18, no gender restrictions. 2. Participants at high risk of COPD (COPD-PS score ≥5). 3. Able to carry out daily activities and wear wearable devices. 4. Willing to participate in the study, willing to comply with the study protocol, and have the ability to sign informed consent. 5. Possess mobile communication equipment, which can meet the requirement of installing wearable device applications and recording function. Exclusion Criteria: 1. Diagnosed with chronic respiratory diseases other than COPD, such as asthma, lung cancer, active tuberculosis, bronchiectasis and diffuse lung diseases (interstitial pneumonia, occupational lung disease, sarcoidosis, etc.). 2. lobectomy and/or lung transplantation, pleural disease. 3. Complicated with serious underlying diseases, including severe mental illness, intellectually impaired diseases, neurological disease (resulting in limb movement disorder), malignant tumor (PS score \> 2), chronic liver disease (transaminase \> 3 times the upper limit of normal), heart failure (NYHA\> Grade 3), autoimmune disease, chronic kidney disease (CKD-5), unstable coronary artery disease, arrhythmia (atrial fibrillation, atrial flutter, severe ventricular arrhythmia), congenital heart disease, pulmonary hypertension, etc., or life expectancy of less than 6 months. 4. Malnutrition (BMI\<18 kg/m2). 5. Bilateral wrist and hand edema, wrist soft tissue injury, inability to wear a watch/bracelet due to incomplete skin. 6. Dual upper limb pigmentation or abnormal blood supply (occlusion, thrombosis, trauma, etc.).