Samsung SM-S975LZKATFN - Manual (Page 34)

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5. Microphones are used during phone calls and allow other
callers to hear you clearly when you are speaking to them.
There are two microphones on the device:
• Bottom microphone: used during handset mode.
• Top microphone: used while an active call is in the speakerphone mode
and assists in noise cancellation (2 microphone solution).
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