Atrial Fibrillation (AF) is when the heart beats in a strange way, often without symptoms. This can lead to stroke. Usually, doctors need to watch the heart for a long time to spot AF, but this can be hard and costly. This study uses smart devices like Apple Watches or Fitbits, which can track heart rhythms with light and motion sensors. The goal is to see if these devices can help find AF using special software called algorithms. The study will have 500 people who have had a stroke. They will wear a wrist device at home for 30 days, 23 hours each day. Data from the device will be checked against regular heart monitors to see if the smart devices work well. The study hopes to show that smart devices might be a cheaper and easier way to check heart rhythms.

• Study duration is 30 days with daily device use.
• Participants must be 55+ years and have had a stroke.
• Participants will receive a wrist device to wear at home.