Although with my version I hear no switching as you select a setting. It just clicks instantly when anything is selected, unfortunately doesn't sound anything like a camera shutter.
Probably a good thing that yours doesn't. I bought one each at my local auction site for next to nothing simply to see if I could use parts in my custom mouse. Mine is probably worn which makes it sound like that. I'll see if cleaning and putting a little grease in select places can make it smoother.
