They can be extremely dangerous if you don't read the instructions first. They clearly say never enter a men's bathroom! :rofl:
My glasses didn't work right, I bought cheap ones. Either the women were wearing X-ray reflective clothing, or the glasses were so strong, I could see right through girls standing in front of me like they weren't even there. The only place they did seem to work was when I was alone in the shower, but then what the heck good was that? :dunno: