Outside Faceplate: 4-3/8" Tall X 3" WideInside Size: 6-1/4" Tall X 3" WideMaterial: Brass And SteelFor 1-3/8" To 1-3/4" Thick Doors180 Degree Viewing AngleUsed To Allow A User To Identify Visitors From The Security Of A Locked DoorTwo Note Mechanical Audible Door ChimeNo Wiring, Batteries Or Electricity Needed
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