App has face detection ability which is set in a way such that it seems like a real naughty or nice face scanner but it is actually a prank app. You can record the screen and share it with friends by unlocking that feature. Also, there is fingerprint scanner as well where does the scanner using finger scanning. How you set the results? Its very easy. When you open the app, you will see the instructions. Pressing left side of start detection button gives nice whereas pressing right side of it gives naughty. For finger print scanner, the start detection button is replaced by show finger print scanner. DISCLAIMER- It has no relation to any real naughty or nice detector. Just meant to the extent of playing prank. Anything you do which is other than entertainment purpose will be at your own risk. We will not be liable for any loses or damages.