Samsung SM-S320VL User Manual page 13

Front View
Proximity sensors: Detect the presence of objects near the
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device.
Front camera: Take self-portraits and record videos of yourself.
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Power key: Press and hold to turn the device on or off, restart it,
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or for quick access to Emergency mode. Press to lock or wake up
the screen.
Back: Return to the previous screen or close a dialog box, menu,
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or keyboard.
Home key: Return to the Home screen.
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Recent: Tap to display recent apps.
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Volume key: Adjust the volume of your device's sounds and audio
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playback.
Earpiece: Listen to a call.
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Getting Started 3 Front View