the recording pen begins to scan the whole class for the voice saying anything about photosynthesis

To be honest, the moment I saw your title, I found it hilarious thinking it was going to be about a pen that will aid students in writing notes but you really swept me off my feet.

Your invention and the idea behind it is just mind-blowing. The fact that it will aim at capturing the lecturers voice alone makes it wow 😍.

I also use Shazam quite a lot to dictate songs I'm unfamiliar with and also for song lyrics. It's my go-to app for music.