DAS.4 SG40, Руководство пользователя

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Bluetooth has been turned on and ensure that
the distance between the watch and your mobile
phone is within 0.5 5m.
b.Please check whether electricity exists in the
watch. If, after the watch is charged for 2 hours,
the problem cannot be solved, please contact us.
2.Why the Bluetooth cannot be connected
occasionally?
The Bluetooth service of some mobile phones
becomes abnormal occasionally at the time of
restart. Usually the Bluetooth can be connected
normally after your mobile phone is restarted.
3.Why an Android mobile phone is disconnected
easily?
The system memory management of an Android
mobile phone turns off the APP on the backstage
forcibly. You need to turn off the power saving
mode or drag the APP to the green backstage of
the FPT System Manager, then the APP will not
be turned off forcibly. When the APP is running
on the backstage, the Bluetooth will not be
disconnected automatically.