The Missing earphone alert function is only available for earbuds with Bluetooth connected status. To use the feature, you can open the Bluetooth settings interface or the Xiaomi Earbuds APP, select [Additional settings], enable [Missing earphone alert], and select [Find your earphones]. At this point, the earbuds will emit a high-frequency buzzing sound.
When you enable this feature, you will receive an alert whenever one of your earbuds is away from your ear or charging case for longer than 3 minutes.