The app takes your text, and rapidly FLASHES it out, symbol by symbol, using the screen of your mobile.
The symbols are of size of the screen, easily visible at 50m.
Best places to use - night streets, clubs, cinemas, discos, rock concerts, and out-of-the-window of any moving vehicles (not driving same time, of course).
You can tell the app that you want to swing the phone from side to side, and it will vibrate when you need to change the direction, so just get in sync with it!
Have fun, activate...