Originally Posted by BellaBoo
My security full glass outside door stays locked 24/7. I can see and talk to anyone on the outside from inside. Every front door needs at least two peephole viewers. One low enough for the shortest person and one high enough for the tallest person.
And even if you live alone, put that second peephole in the door anyway. It's a relatively cheap way to imply to someone that there may be two people inside.