From the switch itself. Installed two switches, both do the same thing. Personally makes sense and doesn't bother me, figure it's a function of the low voltage switching, but she is a bit OCD and doesn't like it. I tried explaining to her how lots of electric/electronic switches have a click when activating loads, but.. here we are.
Decora style. Is the click from the paddle when you push the top or bottom? Or from the slider on the right side when it reaches the end of travel up and down? If this is a mechanical noise it's just how the thing is made. Try another manufacturer.
Yea, the initial click that all decora switches make is heard, follows by what sounds like a little relay. Just the way it's made. Never had a customer complain about it before, this one is ocd to the max. Whatcha gonna do.