I notice that the URL you mentioned — http- heinlink.com heindownload.html — appears to be malformed or potentially suspicious. It contains a space and unusual formatting. It may be a typo, a phishing link, or an attempt to mimic a legitimate site.
The platform supports standard fitness tracking features that can be expanded or refined: Offline Storage : The hardware can store up to 7 days of offline data Sync Logic
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To further unravel the mystery of http://heinlink.com/heindownload.html, future research could focus on:
The domain heinlink.com directs to the Heylink/Funkeep app, designed to pair with smartwatches and fitness trackers to record health metrics such as heart rate and steps. The app is used for data synchronization and is compatible with Android 5.0+ and iOS 8.0+ devices. Download the application safely from the Google Play Store or Apple App Store . MISSION TECHNOLOGY E18 Smart Watch User Guide