Anker A3510 Manuel D'utilisation page 6

Battery Status
red once every 20 seconds.
< 10%
R
Wearing
1. Wear the headset with the mic boom on either side.
2. Adjust the mic boom close to your mouth.
When switching from one side to the other, the mic boom must be lowered all the way
down and directed towards your mouth so that the volume adjustment direction and
sound channels can be adjusted accordingly.
L R
EN 04