This enhances the default screen lock by requiring you to slide a button across the bottom of the screen. The enhanced lock appears when you lock the screen, after your screen fades out, or when you click the icon. It will even prevent your face from hitting buttons during a phone call! It could not be more simple, just download, allow the features & enjoy. Now you can customize the look by choosing your own pictures for the background & you get to decide if you want a 24 hour or 12 hour clock.