It is a free-of-charge application for MP3 conversion, WORKING TOGETHER WITH "VoiceRecorder Pro".The WAV file for conversion is recorded with VoiceRecorder Pro.If you select a file for conversion in the list, after the confirmation message, you can convert it to MP3.If you want to stop halfway through the process, please press the return button and select NO on a dialog to confirm whether to continue. .Progress Bar appears on the top of the screen to show the progress of the process.If there are any files that have already been converted to MP3, the mark of ".wav/.MP3" is attached to those files (unconverted files have the mark of ".wav").