Lock Screen is a free app developed by Performa.nz for Android users. It is a simple utility tool that locks the screen of your device without using the power button. This app helps save the power button's life by allowing the user to lock the screen without pressing the power button.

Lock Screen is an ad-free app that requires no permissions. It does not have an interface and only displays a warning message dialog. In order to use the app, the user must give device administrator privilege to the app. To uninstall the app, the user must first revoke the device administrator privilege and then uninstall it.

Overall, Lock Screen is a useful app for Android users who want to save their power button's life. It is easy to use and requires no special permissions or interface.