No se batalló nada para ponerlos a funcionar. The case will charge the buds for several time before require a recharge, which enough for a day use. Putting it further from my mouth appears to make this better. Easy to fit to my vehicle. :-I am rider, so it?s not getting fit if you wear helmet. I would suggest starting at the bottom, then top, then middle. First of all, this was actually quite difficult to assemble and many of the parts were very sharp, so take care with them. For me, these slippers work very well and are very comfy. My normal street shoe size is 7. I started organizing and found these and others on Amazon I bought a bunch.