Huawei TalkBand B3 Quick Start Manual page 12

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Removing or installing the Bluetooth headset.
Press the two buttons on either side
of the strap to pop up the Bluetooth
headset and remove the headset
from the base.
After you have finished, install the
headset with the earcap back in the
strap. You will hear a "click" sound
when the headset fits back in place.
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