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Talk mode
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To answer a call press the multifunctional button once
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To hang up press the multifunctional button once during a phone call
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To reject a call press and hold the multifunctional button for 2 seconds
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To switch audio during voice call press and hold the multifunctional button for
1 second to switch from headphones to a smartphone, and do the same to
switch back to headphones.
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