A door viewer will allow you to identify visitors without opening the door or revealing your presence. A door viewer is an optical device fitted through a door to enable you to view the other side of the door without opening the door. Door viewers come in various designs, and knowing the different types can help you choose one that is best for you.
Lens degree:160/180/200/220,
Lens material: Glass, Plastic, Resin.Body material: Brass/Zinc alloy All surface finishes are Available: Sa...