These knockers install onto the outside of doors and create a loud sound that lets occupants know someone is at the door.

Door viewers allow occupants to see who’s at the door without opening it. They provide different viewing angles, with wider-angle viewers providing a better view of visitors and their surroundings.

These combination units provide a door knocker and viewer in one, so occupants can see who’s waiting at the door and hear a visitor’s knock.

Door viewer covers block the viewing hole on the inside of a door for added privacy and security. These covers prevent people from looking inside and viewing the interior of a building or room.