Samsung galaxy S5 - Manual (Page 26)

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17. Gestures Sensor used to detect Air View and Air Gesture
motions.
18. Proximity Sensor detects how close an object is to the
surface of the screen. This is typically used to detect
when your face is pressed up against the screen, such
as during a phone call.
• While talking on the phone, the sensor detects talk activity and
locks the keypad to prevent accidental key presses.
19. Receiver allows you to hear the other caller.
20. Microphone - top used while an active call is in the
speakerphone mode and assists in noise cancellation
(2 microphone solution).
Back View
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