Validation of Software for Assessment of Atrial Fibrillation From PPG Data Acquired by a Wearable Smartwatch

Inclusion Criteria: * Adults 22 years of age or older * Capable of giving informed consent * U.S. resident * No prior history of atrial fibrillation or atrial flutter * Fitbit account, with one of the following devices paired: * Ionic, Versa, Versa Lite, Versa 2, Versa 3, Charge 3, Charge 4, Inspire HR, Inspire 2, or Sense updated to the latest available firmware. Exclusion Criteria: * Diagnosis or history of Atrial Fibrillation at time of consent * Diagnosis or history of Atrial Flutter at time of consent * Current use of anticoagulation medication * Cardiac pacemaker or implantable cardioverter-defibrillator