People usually use peep hole on a door to, well, as the name implies, peep through to see who’s outside their door. This is to decide whether they want to open the door, or ran through the back door and promise yourself to pay the 5 months overdue bill very soon.

If the one who knock at your door had one of this gadget, then you are out of luck. Using a series of lenses the reverse viewer will let you peeping into the house instead. Reverse engineering anyone? Of course, the main down turn is that everybody could happen to see you peeping into the door pretty obviously. It’s ok if they just think that you’re crazy, but it would be shameful if they came to you and told you that you are supposed to look into the peep hole from the inside. Now that would be a major embarrassment. Just keep this in mind. Other than that, the gadget is pretty tempting.

via OhGizmo!