I bought this with the intention of using it to listen to music with my cel phone while I work out. It claims that its sweat resistant, but after the third time I used it, it started adjusting the volume up and down randomly, and then started making random phone calls, after getting a little sweat on it. I tried it one more time for my next workout and it started doing the same thing again. It seems to work ok when I'm not working out.I would have given it 3.5 - 4 stars without this problem, but the whole reason I bought it was to not be wired to a music device when I work out. It is completely useless for that purpose, and it doesnt work as well as my other bluetooth headsets for talking on the phone, so it is pretty much useless to me.