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Can any tech / safety / gadget minded NeoGAFian help with an odd question?

Men_in_Boxes

Snake Oil Salesman
I have a door. I need this door to be closed by whatever human uses it.

I'm imagining a gadget you put on the door and on the wall, where an alarm sounds every time the door gadget and the wall gadget aren't connected. I feel like I've seen weird infomercials where a gadget like this is put on windows to alert / scare would be burglars from entering your home.

Does anything like this exist?

Mods, nuke this thread if it's not appropriate. I only posted here because my Googling has yielded 0 results and I'm a little desperate.
 

Tajaz2426

Psychology PhD from Wikipedia University
Is this for child safety? Like letting you know if a small one escapes on opens a door? If so, I have the ones the poster a couple above posted. I use them on the doors for my grandchildren and on the windows as alarms. There are also sensors available that alert your phone right away, if you want that.
 

SJRB

Gold Member
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