The M4U is a great headphone for air travel or commuting by public transit, thanks to its active noise cancellation. Also works well without power as a standard headphone, plus there’s even a powered Room Feel mode. Takes 2xAA batteries. Although they’ve seen use , they’re in great shape (a little wear on the headband pad, see picture) and the only reason I’m parting with them is a transition to a pair of CIEMs.
Included: new spare ear pads, smartphone-compatible cable with 3.5 mm TRRS termination, carrying case, free US domestic USPS shipping
Not Included: original packaging, manuals, standard cable, batteries