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You can type in text to transmit, or press a button to easily send canned text messages, such as CQ calls.  Sound is picked up from your radio's speaker via the internal mic in your device, and transmitted audio comes out the speaker - you can also connect a patch cable to your radio's mic input via the headphone jack on your device to transmit the audio, if you wish.  Canned text buttons are also available, touch one to send the text stored for that button.  When sent, it will be taken off the left end of this field, and displayed on the right end of the transmitted text field, to the left of the entry field, in a scrolling fashion.  To decode transmissions, you just need to run the app, and set it near the radio's speaker or headphones, and watch the decoded text appear.  To transmit text, touch on the text entry field, and start typing.  Hellschreiber is a teleprinter system, developed in the 1920s, that transmits text via sound, much like an old facsimile (fax) system.  You can edit the name of the button, as well as the text.  Feld Hellschreiber lets you decode and transmit Feld Hell messages.  Today it is used by amateur (ham) radio operators around the world to send messages to each other via shortwave radio.  Decoded text is continuously scrolled across the top of the display.  To edit a button, touch the Setup button, and then select the button you wish to edit.  Feld Hellschreiber literally means "bright field recorder".  It was used by the German military during World War II to send messages encrypted by ENIGMA machines.  It works even under very noisy and poor reception conditions, because your brain does the work of analyzing the received image to pick out the characters.  Each pixel of a character is transmitted as a short burst of audio.  The slider control adjusts the display contrast, and the indicator to the right shows the volume.  Hellschreiber is sometimes referred to as simply Hell.  Adjust the slider for the best display.  Each character will be sent when possible.