V7 HB600S Mode D'emploi page 7

Plug the optional charging stand into a powered USB port on your PC,
docking station or USB wall charger and then dock the headset. It takes
approximately 3 hours to fully charge the headset.
Muting the Boom Mic: Depress and hold the button for 2 seconds.
Muting the internal Mic: (When boom mic is not in use)
Depress and hold the call key 2 seconds.
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