Simply turn off (lock) screen
This simple and lightweight application just turn screen off (lock).
Let you hardware Power button rest for a while.
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Application will ask you to activate Administrator (Settings -> Security and screen lock -> Administrator) before use.
To uninstall app you will need to deactivate Administrator first.
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App may work as normal and by widget.
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App may work not correctly on some devices or screen may blink after turning off, in particular if PIN or Keylock is set. Then try another application with the same functionality.
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This app uses the Device Administrator permission to be able to switch off display.