This will not work on latest Android 4.0.4 release with System Screen Lock enabled.
This is a small & simple tools just to let you switch off and lock the screen.
You may use this together with the launcher which able to customize the dock or gesture shortcut. In this way, it is easier to switch off the screen.
For this app to work, you may have to activate the Device Administrator.
Before Uninstall this app, you have to deactivate this device admin in: Settings -> Location & security -> Select device administrators
Tags: how to add device administrator , zzz passwords,