Warning: You can not insert the plug into the socket when the fuse is there, but the backup must remove. We like that very well.
One just needs to be careful that you put the protection back into the socket once you have pulled the plug.
It is a pity that there is the connector only in white. If one example outlet of course super. It would be ideal if the manufacturer would still offer other colors.
Price / performance ratio in my view in order. Compared to other electrical outlet covers namely a steep price, but also absolutely safe, no installation necessary and easy to use.