The lid is meticulously crafted, fits properly and is simply screwed onto the Olympus 14-42 EZ lens front like a filter. On the Panasonic 12-32 it should also work. Thereafter, the blades are automatically opened during the extension of the objective, as with a compact camera, the cover therefore never needs to be removed neither.
The slats cover have advantages (quick, convenient) and disadvantages (less dust-proof and stable), but this is here for the evaluation irrelevant who buys these will cover precisely the rapid deployment. And that works just fine.
Therefore actually 5 star. Because of the price (because you get already 1/2 compact camera), I prefer considering the actually simple mechanical design a star from. For under 20 there were 5 stars.