Also, USB connection is loose and comes free easily. If you wear a womens 7 most wear a childrens 5 but I prefer the 4. Bought one first to see if it way any good. Have the iPhone 11 so having these in my purse is awesome. ” Most portable speakers can’t even attempt to reproduce that low level of hertz bass line. :) BUT seriously as soon as I stuck them on I had instant relief! I looked up "wide sandals* and this popped up and there seemed to be a lot of other wide footed peeps that really liked this shoe. Beautifully comfortable as I would expect from Birkenstock’s They are a tad too small but Im sure once they get broken in they will fit much better. Ive not had an issue charging the case.