A free program for Android, by Music Media 2019.

It’s a smart lock screen app with a simple and clean user interface, which lets you customize it with your own unique lock screen design. The app is easy to use and has a beautiful user interface. It’s also very easy to install and use. All you need to do is download the app, customize it with your own unique design, and you’re done!

You can choose from three to eight knocks, and you can specify the location of the knock on the screen. Test it out today by downloading and installing it onto your mobile device.