A key lock screen

Simple, fast, pure, no advertising a key lock screen, from the release of your phone's physical key pressure.

note:

* The first time you start the program need to apply for device manager permissions, or the program can not lock a lock, this permission is only used for a key lock screen function.

* To uninstall, need to go to Settings - Security - Device Manager to unlock the lock and then uninstall the lock.