BLACK View Master
If ninjas had viewmasters...
Still can't see who is outside of your door? I had the sorriest peephole at my last apartment. This viewer really lets you see who is knocking at your door. This is a great idea for anyone concerned about thier safety.
Option 1: Trip on acid. Option 2: buy one of these. The choice is yours.
You simply haven't properly seen the world until you've seen a part of it through a viewmaster.
Just place the viewer over the peephole and you can see who is looking at you. Now you are prepared to see what you are about to enter.