Anti-lost

Instructions:

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Please note:

1. In order to keep the bluetooth connection between your phone and the tracker, please keep the application running in the background.
2. If you receive an alert when the application is opened, there will be an alarm popover in figure 3 (with sound).
3. Only allows 1 user to use the bluetooth anti-lost function.
4. Anti-lost alert will send notifications to the user who turned it on.