Gary, the caption or comments or whatever under the video on YouTube states that this was done with one (1) SM58 mic.

I tried 8 different mic's that everyone recommended to me back when I started keyboarding and doing vocals, and the SM58 is the only one that didn't Pop-Out the P(s) for my vocals. All the other mics, an audio something, something 757 and others exaggerated the popping P(s) for my voice. It was pathetic. I have two SM58s. It's the best for my vocals. It even gives me more confidence because I don't have to worry about that stinking pha sound. Lol!