I bought this thinking it would charge either Apple or android devices. As before, when ordering the replacement pair I just received, I specified size 12. It’s a tight squeeze for my toes and I don’t have wide feet. I am 5’6 140lbs and got the large, it was too big and I had to pin it but the reviews made me nervous it would be too small. You have to get your phone and turn it off and go back to your music and then turn it on. However, I need to be able to use them for audio recording and I can still hear everything happening around me as well as the speakers through the recording equipment. These work great! They hug my feet, not flopping around, which can cause tripping. This is how my product arrived to my house! These (exact same size) rub in several spots limiting their use to taking the trash out.