The ATH-M50xBT wireless is compatible with AptX® and AAC codecs, has a 15Hz-28kHz frequency response, and runs for 40 hours on its built-in rechargeable lithium-ion battery. There are the same fold-flat design and 90-degree swiveling ear cups, and the same professional-grade ear pads and headband from the ATH-M50x.

The ATH-M50xBT comes with a 1-foot USB charging cable, a detachable 3.9-foot cable with in-line mic for (wired) cellphone calls with non-Bluetooth phones. The on/off switch, USB charging jack, smartphone cable jack, +/- volume control, and buttons for pausing music and answer/end phone calls are all located in the left ear cup.

I immediately put the M50xBTs to work on my morning 3-mile walk. They pair up quickly with my iPhone X and they fit comfortably on my head. They sufficiently block street noise--not completely as it can be dangerous if I miss hearing an approaching Prius or Tesla! Sound level is as loud as you can imagine and I liked the local volume up/down controls on the left ear cup.

Making phones calls is awesome with big fat sound for the caller and solid, communication quality for my out-going call audio--considering the location of the mic under the on/off switch in the left ear cup. I like the big fat sound of all of my music collection from my iPhone and just touching the left ear cup wakes up the iPhone's Siri Voice Assistant. Awesome!

With all cables required and carrying pouch, the Audio-Technica ATH-M50xBT wireless headphones sell for $199MSRP.