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.