It's a great little unit except for one thing, the little earphones that are supposed to be inserted into the ear are too big (long) to fit inside a human ear. If you don't fit the whole earphone in the ear then the fit is so loose they'd fall out on their own even if you don't move your head.
Other than this problem, they are great headphones, good sound quality, very lightweight, easy to pair and use....for that reason I tried a lot to fit them in any way possible, but it didn't work out. Finally, after 2 days of frustrating efforts I had to send them back.
It's up to you if you heed this warning or not, but I'd suggest obtaining the exact dimensions of the earbud piece and comparing that to the space in your ear where it'd fit, it might save you the time and effort to order it and return it.