High-impact plastic housing requires a 1-3/4 in hole. Clear image prism construction allows arms length viewing with nearly 2 in of giant screen viewing. Fits 1-3/8 in to 2 in thick wood or metal doors. Prism image is a reversed and mirrored image.
High impact plastic construction
High impact plastic construction
Clear-image prism construction
For best results when using viewer at night, use less lighting inside than that which is illuminating the exterior side of the entry door