Try 12VDC or 120VAC.
My unit is pretty quiet, only at its highest speed, and setting does the sound come to somewhat a disruptive level. It seems powerful because of the size and because of the number of fans (6) it has inside, but it's hard to say definitively how powerful it is and nowhere on the literature or videos provided by a shark do I see a concrete size of the room that this is intended for leaving the customer to just guess.
The remote control works really well and the filter is very easy to deal with.
The literature says to clean the internal behind the filter every two months with a vacuum and maybe a cloth but no cleaning products. My filter, according to the digital display, comes with 4,400 hours of use and the unit keeps track of these apparently. I haven't seen the filters available for these, maybe they aren't released yet because they didn't come up on the
website search.