My feet swell significantly so I need flexibility. They charge while sitting in the case, which you connect to a power supply via the include cable. Its nice that its wireless, except half the time theres either noticeable input lag, or it cuts out. Not only do they fit in the case, they also don’t slip out of your ears and they are EASY to install. There are also some other models if you want to mount to a bench or wall. Thanks to the usual bargain of Amazon, these cost about the same as the supermarket shoes Id usually go for but have lasted so much better. Easy to assemble,Although the instructions are not the best. I had an older version of these in black. I wear them often so Im giving them another star. The speaker did not work at all.