So, not only is there a Momentum M2, there is a Momentum wireless Bluetooth with ANC. Personally not interested as wire do not bother me. What does is a small piece of technology breaking that would render the phones useless, such as say a slimline hinge, battery, amp/volume control, bluetooth receiver etc. It is not a matter of if but when and that is $500 down the drain (after the 2 year warranty). So very glad that they have it an option.