It broke and of course this is why the rack was never sturdy. I just leave it plugged in 24/7 And it does the rest. I am looking for a replacement. They are easy to keep on and my feet stay nice and warm! The noise cancelling does completely make my cpu fan noise go away. It?s very sturdy when strapped snugly. Souliers vraiment très confortables, très légers et souples. I cannot comment on technical aspects of this keyboard since i am a really not good with tech and need to use it to write reports. That could be just be me though, I wouldnt take a star away because of it. They are made offshore in several different countries, but the quality is excellent.