No major problem at all. Purchased for the big hubby?s feet. This little speaker takes it to the next level! Obviously, don?t wear them in the shower, I?m pretty sure they will tarnish. I did not use the supplied mounting screws as I like them to be more sturdy. Kind of disappointed because they are sparkly which the ad doesn?t say and they don?t look like it in pictures. Easily taught to kids (Id suggest 8 yrs and up), nice wooden components and burlap carrying bag. Most of the time it doesnt see my mouse and RGB turns off. It?s very frustrating to have a sandal blowout when you?re out and about and is very disappointing because these are so comfortable. I am wearing thin socks and it is a tight fit.