Acer A200 - Manual (Page 11)

11 Locking your tablet
Locking your tablet
If you will not use your tablet for a while, briefly press the power button to lock
access. This saves power and ensures your tablet does not unintentionally use
any services. Your tablet will lock automatically if it is not used after a while. To
change the delay, tap Apps > Settings > Screen > Timeout.
Waking your tablet
If the screen is off and the tablet does not react to any taps on the screen, then
it has been locked and is in sleep mode.
To wake your tablet, press the power button. Your tablet will display the Lock
screen. Drag the lock symbol to the edge of the circle to unlock the tablet.
Quick start icons
When you hold the lock symbol, the circle is shown, with four icons for
commonly used applications. Drag the lock symbol to any of these icons to
unlock the tablet and open that application immediately. Drag the symbol to
an empty area on the right to resume without starting a new application.
Note: Open Apps > Settings > Lock screen to change these applications.
Security Options
For additional security, you may set a code or number that must be entered to
access the tablet, such as an unlock pattern (a set of dots that must be tapped in
the correct order). Open the Home screen and tap Apps > Settings > Location &
security > Configure lock screen.