Very simple to use: just enter your message in a text field in English (digits punctuation and Russian characters are also supported) tap 'Transmit' and after a short delay which will let you turn the screen towards the receiving party the whole screen will start blinking white signalling your message in Morse code. You can also turn on the sound so that you can listen to the message being transmitted. Also you can now use your phone's camera flash to transmit the messages. However turning the flash on and off can block the message transmission thread a bit which could lead to unstable transmission rate.

You can set the transmission rate from 5 WPM to 40 WPM (in 5 WPM steps).

The application keeps a log of messages sent. That log is stored in the preferences and is loaded back next time you open the app.