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.
 
GE Personal Security Window and Door Alarm, 2 Pack, DIY Protection, Burglar Alert, Wireless Chime/Alarm, Easy Installation, Home Security, Ideal for Home, Garage, Apartment and More, 45115 White
https://a.co/d/1wyRGOm
 
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.
 
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