Yes, an activity tracker watch can sync with a smartphone or computer. Most modern activity trackers are designed to be compatible with smartphones and computers, allowing them to sync data wirelessly. This syncing capability enables users to transfer activity and health information, such as steps taken, heart rate, calories burned, and sleep patterns, from the tracker to their smartphone or computer. Users can then view their data, analyze trends, set goals, and track their progress using dedicated mobile apps or desktop software provided by the manufacturer. Syncing also enables software updates and allows users to receive notifications, such as calls or messages, on their activity tracker display.