Very low profile, fits easily under any board. I actually like that the ac-dc transfo is separate because it means I can stick it behind my board.My only complaint is that although it is quieter than the previous power supply I had (Vitoos), it's not silent either. I have 4 digital pedals on my board and although I can't hear those weird high pitched digital noises like before I still have some kind of slight hiss. Not sure if any power supply would be able to get rid of that though. I wonder if I should have gone with a Cioks instead...