Samsung GALAXY S7 User Manual page 26

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Proximity sensor
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Turns off the screen and disables touch functionality when the
device is in close proximity to the human body.
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Turns the screen back on and enables touch functionality when
the device is outside a specific range from the human body.
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Power key
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Briefly press to turn on or off the screen.
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Press and hold to select a power control option.
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Home key
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Press and hold to launch Google.
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Press twice to launch the camera.
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Activate the Fingerprint security feature.
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Volume keys
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Adjust the volume for ringtones, calls, or notifications.
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In the Camera app, press a volume key to take a photo.
Learn About Your Device 17