These are identical to Sennheiser G4ME1 phones but with a removable cable. They are the best microphone noise cancelling units Ive tested (mic is very good at rejecting outside noise) and the earphones (not - noise cancelling, but open back) are extremely comfortable - suitable for extended use. Audio quality is excellent - comparable with other audiophile headphones in the $200 range. Removable cable is a nice feature. I use these almost exclusively for conference calls at home - where I appreciate the open back design as it lets me still hear the door (and alarms). Highly, highly recommended. I have 2!