A:Answer Hello!
As noted by the other users, the QC35 II headphones come with a USB A--Micro B cable for charging the headphones. Whilst the cable that came with the system is recommended, any such reliable cable will be able to charge the headphones. The charge time is around 2.25 hours to charge from 0% to 100%, and will hold a charge for 20 hours when used wirelessly, and 40 hours when wired.
We hope this helps clear this up for you!