Transient or Sudden Symptoms Patients with Suspected Heart Disease Patients on Medications Post Interventional Procedures People at High Risk for Cardiovascular Disease Bradycardia or Tachycardia Dizziness Drug Resistance Checking the Frequency of Atrial Fibrillation and Arrhythmias Diabetic Patients Atrial Fibrillation (AF) Palpitations Drug Efficacy Checking the Severity of Atrial Fibrillation and Arrhythmias High Blood Pressure Arrhythmias Chest Pain/Arm Pain Medication Adherence Cholesterol Hypercalcemia Fainting Shortness of Breath Obesity Smokers, etc. At the same time, as a new portable digital medical testing equipment, portable ECG monitoring can be used as a medical Internet of Things terminal instrument to collect human physiological signals, which can be quickly transmitted to the back-end service platform through modern communication technology means.