It is possible to set up audioboom only on a mobile of course, and the students would probably use it like that, however, for the teacher ...
Suggested step 1: set up audioboom on your laptop,
as clearly explained by Russell Stannard here
This video demonstration of setting up and using audioboom on an iphone has not been made by a specialist! So here's hoping you find more options than are shown here. It will be similar on an android of course.
Then when you go to audioboom on your laptop, the recording is there :-)
The recording made during the demonstration has been embedded from audioboom here: