I was not able to change the volume one time without pause / play / fast forward. >_< Its kind of odd. They will surprise you. Son una pasada! 5 is my size. When to internet, A-T warranty was available; the instructions were simple, I shipped it and got a new once in 2 weeks with even calling or sending and email; great costumer service, I was happy. ARE THEY TOO LOUD?I did not think these were too loud. LOVE VIONIC AND YOU GET GREAT LOOKING PRODUCTS THAT ACTUALLY HELP YOUR FEET! Shoe is very comfortable and stylish