I measured the inflator as 82dB, and both of my cordless drills come in at 80dB. So it's just a bit louder than a cordless drill. The sound of the pump isn't high pitched at all, it's a lower tone than a typical drill.

But the best part is that it will take a 700x25 from flat to 90psi in 20-25 seconds, while you just stand there holding the trigger. Topping off the tires from overnight pressure loss takes a few seconds. I get 2+ weeks of use per charge-- riding every day, and airing my tires before every ride.