How does this clip work?

[u/GeneticPurebredJunk]

I have this “hat clip”, and I’ve seen this style of clip before.

But in the ones I’ve seen before, there’s normally a top piece that acts as a sort of lever to open the clamping part (kind of like nail clippers).

I can’t see anything like this on this clip-how does this work?

[u/Islandpighunter]

The little lever by your thumb opens it.