!!! Please, do not assign poor ratings, if you did not read the note below !!!
!!! IMPORTANT !!!: Before uninstall, disable Device Administration in ScreenLock Settings (in your app drawer, next to ScreenLock app) or in device's Settings / Security / Device Administrators screen.
Zoromatic ScreenLock is standalone Android application which allows user to lock device's screen, with one single click. This is not a widget, so it does not reside in memory, it turns itself off after lock.
This app uses the Device Administrator permission. Use ScreenLock Settings to enable it.