Mic or headphone w/ built-in mic?

[bio-nonymous]

A question just occurred to me....If I'm teaching asynchronously, do I need headphones at all? I'm only going to be recording lectures. If I meet with students over Zoom, the mic and speakers on my computer seem to already be good enough.

One reason is background noise--shotgun mike right next to you off your headset coupled with good noise reduction really helps (for example, I have a large fishtank in my office and if I didn't do what I do the background sound would be unbearable--good for whitenoise, not so good when recording a lesson).

[Biologist_]

I sometimes run Camtasia on my personal laptop to record a lecture. The built-in microphone is okay to start, but then the laptop heats up and the fan comes on and gradually gets louder and louder. After a while, the whine from the fan is really annoying if I record audio through the built-in mic. It's much better with my cheap external microphone. I didn't realize it was a problem until I listened to a lecture that I had recorded.