My SA showed me how to use it and it's really easy. Also it accommodates those bulky electronic car keyless remotes too. I forgot to buy it. Went back and they were sold out.
There's a ring inside and if you unsnap the exterior button you can pull your keys out. When you're not using it. You pull the tab back down and snap it close and the keys are safely tucked inside so your bags and cases will not be scratched by any keys.
Clochette was made for Euro keys initially and not available in the US. And now they are available, but not many ppl want to pay that much for a key case. I just forgot to buy mine.