They will noticeable squeak on non-carpeted floors. It has happened twice to me now: I think I have 50% battery life left, then 10 minutes of listening time later the headphones tell me "battery is low" 3 times at about a 1 minute interval, and then they shut off. I am pleased with this this towel holder. I immediately threw it away! But because the CBK1902 wasnt available, they wanted to send me the upgraded version, the CBK1901, for no charge. )For lunges and calf raises where you move from flat foot to your toes and back again, I find the shoe nicely flexible. They are great to wear around the resort or for short walks. Brilliant fit and comfortable. -Il microfono è ottimo, ha la possibilità di attivare la cancellazione del rumore. Too bad it took him that long to find good house shoes.