The sweet sound of better silence. The Bose Noise Cancelling Headphones 700 are packed full of all the features you need for superior sound and premium quiet — including 11 customizable levels of noise cancellation with situational awareness for when you want to let the world in. They are in top condition, only worn about five times and over 3 hours total. The only reason I'm sealing them is that I am not used to the over-ear headphones, but to me, the best noise-canceling ear cover headphone