The extension mechanism seems to work well but you have to twist hard to lock/unlock it. They don?t cost much and the sound reflects that. So great for traveling with. I purchased for shooting guns and hunting. It was super cute though It?s a nice bracelet however the cross is much larger than it looks in the photos, I was expecting a more delicate cross and slightly better quality, it?s a bit dented. Decent buy for some decent headphones I purchased these for my Xbox one and as far as comfort goes, these are nice but the headphones and the adapter that you have to plug into the controller always has to be plugged in and thats kind of annoying. The sole pulled off on one slipper a few days ago. Portability: It does not fold flat like the Sony. I peeled off the plastic, thinking there was some sort of mild adhesive underneath, that I happened to overlook.