Visual Door ViewerA **Visual Door Viewer** is a security device installed on doors that allows users to see who is outside without opening the door. It typically features a **wide angle lens** and can be either a **digital or analog** model. Key features include: **Clear Viewing**: Provides a clear visual of the area outside the door, with some models offering high definition (HD) screens for a more detailed view. **Wide Viewing Angle**: Ensures a broad perspective,