Update 1/8/13- Now having these for 2 1/2 years, I am downgrading this recommendation even more. It is incredibly frustrating that they cannot do the basics such as having some kind of indicator showing when the device is on or off.  Even without that, it should have a marking on the earphones indicating on/off.  Lazy design, lazy engineering, lazy thinking.  They really don't deserve your hard-earned money!