It is a hole,Can observe inside room situation through Door Hole by this item directly, monitored the room situation from outsider.
Hole Peephole Reverse Viewer View Angle Specification:
1. Easy to use. Put this item on the common Door Hole outside and can see what happen inside
2. Can work with these common video camera and digital DV
3. Diopter is adjustable according to individual eyesight
4. It can work as a mini 7 times telescope if you observe this item from oppsite direction
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