Say a phrase or ask a question, then place your finger. Wait for a realistic scanner and find out if this is true or not? The app answers true or false. Entertaining app!
If you want to play a trick on your friends - before scanning your finger, quietly press the secret buttons on the corners of the screen. The right buttons always give "true", and the left - "false". It's very funny! If the secret buttons were not pressed, the application will give a response randomly.