The user must have a sound card and a microphone connected to the computer, so students will not be able to use this from most on-campus computers. The user is prompted to allow Flash to access the system's microphone. Since Flash is required, iOS devices cannot use it. :-(
It records in WAV format, and the limit is 1 minute. The recording is not embedded but is attached to the news item. For discussions, multiple recordings can be added to a single message. For those dropbox folders limited to a single file per submission, the audio recording counts as that file so for those dropbox folders students should be warned not to use the audio recording.