After unpacking it took approximately 10 minutes to put this unit together; super simple assembly there are no nuts, bolts, screws and no tools needed! I bought these for my sister and she loves them. It should have been aluminum. Will not order again. Those cheapies dont. And easy to carry the case that it comes in is a charging case so when the earphones them self die you just put them back in the case and they charge without being plugged in to the wall. These are wrong headphones, wrong model. So lassen sich Regen, Wind, Wasser und auch Vogelgeräusche einblenden. Unfortunately, the stitching was flawed right out of the box.