Questions about Max Hauri Socket protector

Well, I bought the product for CHF 6.65 in August 2021. CHF 2.80 is already a lot less.

Insert a two-pin plug into the 2 holes and then pull the whole thing out.

If you still have a socket protector left, you can put the two into each other and pull them out at a slight angle. Otherwise, carefully insert a pair of needle-nose pliers into the two holes and pull out the plug. Although the combination of "pliers" and "socket" is not really recommended...