The product has exceeded my expectations. I opened them and let them air out and fluff up for a day. He said they stay on during his work out even while hes sweating. took about 15 minutes. There is tons of grip. There are no firmware on the earbuds to update as well. I was able to put all of my random pairs of wine glasses into the rack and I will just keep my Riedels in the cupboard. my original one always giving me 100%battery. I advise you to do so now. Nur so konnte ich die Signalqualität von ?weak? auf ?good? steigern.