Past return period. I am sorry to say, After some research on both official Birkenstock USA and Birkenstock UK websites, I have determined these must be fake. But I would say the average teenager or adult should be able to do it. Battery lasts a long time, the unit looks great (very small and sleek). - the sound quality isnt mind-blowing, but its nothing to dismiss either. I could have made the 11 work with a shoe stretcher, but it was very, very snug and had an odd feel to the balance in the sole relative to my foot. I cant even tell that there is a shield on the watch. Like others Say . Now its too late to return. They come with two cushions and replacement scrims (the mesh that covers the in-can speakers).