Samsung GALAXY S4 User Manual page 26

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Earpiece: Plays sounds.
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Status light: displays blue when powering up, displays red when
charging, green when fully charged, and red blinking when a
notification has arrived.
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Speaker: allows you to hear the caller.
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Menu: Touch to display a context-sensitive menu of options for
the current screen or feature. While using your device, you may
notice that the Menu Key dims, but it is always available at a
touch to provide a context-sensitive menu for the current screen
or app (you can set the touch key light duration, see page 142).
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Home: Press to display the Home screen, or Lock screen if the
device is locked. Press and hold to display recent applications or
launch Task Manager or Google Search. Press twice from an
unlocked screen to launch S Voice.
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Back: Touch to return to the previous screen or option. While
using your device, you may notice that the Back Key dims, but
you can always use it to return to the previous item.
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Home screen indicator: Indicates which screen is currently
displayed.
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Google Quick Search bar: a shortcut to Google Search that
allows you to search for items on the internet.
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DRAFT - Internal Use Only
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Display: Displays screens, applications, connection status,
received signal strength, phone battery level, time and local
weather.
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2.0 MP Front Camera: Captures pictures and video.
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Proximity and Light Sensors: Detects the presence of objects,
for use with motion settings, and to control the screen display,
such as when you move the device away from your ear during a
call. Detects ambient light when Automatic brightness is enabled,
and when using the Front camera.