Increase security by adding a door viewer.
There are different types of door viewers. For narrow smaller areas consider a 160-degree viewer.
For large porches consider a 180-200 degree viewer, with a knocker to add some accent. To begin you will need door viewer, drill, screwdrivers and silicone sealant.
Determine a height that is comfortable for your family.
Mark where you will be mounting the door viewer.
Insert the door viewer.