The Screen Lock Wallpaper
You can set the display to turn off automatically after a timeout period
of inactivity, or turn it off manually by pressing the power button 
.
When you press the power button 
to wake up the display, the screen lock wallpaper appears to help prevent unintentional touches of the screen, and displays current time, date, and the alarm set indicator.
1
2
1Drag or flick this button downward to enable or disable the vibration mode.
2Drag or flick this button upward to unlock the screen.
NOTE: To set how long the screen remains on before turning off after the last operation, touch the Home button 
→Menu button 
→ Settings→Display→Screen timeout.
Understanding Your Dell™ Streak
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