Finally something sensible!

this socket guards are thick, and easy to plug into the wall socket.
You can not plug into the wall socket if the backup is in there, but the backup must remove.
Why I like it?
We have previously tried many socket guards, and all is over time jumped out the spring, and half of the security, which is why not only the outlet was uncertain, but also flew very dangerous small parts of my baby. They were usually so small that only my son has found under the bed or closet.
Here is finally different because even if the child knocks with nem toy against it remains intact (It's a piece of plastic throughout, without any mechanics)!
The security is very easy to remove with a plug, and then only with a connector (tested with many things!)

So it is for me the best backup, because if I need the outlet, I put the fuse off and stick it back in, when I pull the plug.

So for all that true security without any risk (and permanently guaranteed) want, this article is highly recommended! (By the way, the operation is also very easy for older children, and easy to understand, as opposed to the heavy rotating parts, also tested)
I hope I could help!