Very easy installation in relation to the actual product and very good visibility from the outside. Now I made 1 mistake drilling the hole. I bought a wood door drill and it didn't work because my front door is metal! I did not know that. So I messed everything up at first before realizing something was wrong. All my fault. I love how this peephole has such a great, clear and wide view. You can't see anything from the outside either. I don't know if there are door monitoring tools that anyone can use, but if they do they only see the stairs so I'm not worried. To tighten the peephole I used a quarter and it worked.
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