jerryc41 wrote:
I remember them from one of the CSI shows - used by the medical examiner. I could never see the advantage of clicking them together. I sometimes have a retainer of some kind on mine so I can hang them around my neck, as you do, "...keep them around my neck during the entire outing."
They are a snug fit. Not tight, but little room for movement. Popping them apart lets you get them over your nose easier.