Samsung SM-J320A User Manual page 11

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Proximity sensors
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Turns off the screen and disables touch
functionality during a call when the device is in
close proximity to the body.
-
Turns the screen back on and enables touch
functionality during a call when the device is
outside a specific range from the body.
•
Power key
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Press to turn the screen on or off.
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Press and hold to select a power control option.
•
Volume keys
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Adjust the volume for ringtones, calls,
notifications, and system sounds.
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In the camera app, press a volume key to take a
photo.
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