I had a problem with the BT my macbook pro 2011 2.1 mute, when I listened with my wireless headset. I was told that it probably came from the aluminum hull. banco I bought this little key for 10 euros including shipping and it works perfectly and it does not exceed too much, she is discreet with a nice blue LED :-) by cons if you are on a priori PC WINDOWS 7 8 Non ok but ....