https://www.theverge.com/circuitbreaker/2018/10/30/18039988/audio-technica-m50xbt-bluetooth5-wireless-headphones-price-release-date

The pair of headphones that most people discover when they decide to upgrade to a higher-fidelity sound than their old Beats is the Audio-Technica M50x. Originally designed for professional use, these headphones started life in 2007 as the M50 model that had a fixed cable, evolved into the M50x in 2014 with a removable cable, and today blossom into the M50xBT that requires no cable at all. The look, design, and sound signature have barely changed in all that time, and Audio-Technica promises that the new wireless M50xBT will maintain everything familiar and beloved about the existing M50 lineage.

Developed by the same two engineers as the original M50s, the M50xBT have been built with wireless performance as the priority — so much so that Audio-Technica says they’ll sound pretty much identical to the M50x when used wirelessly, and different (read: worse) when wired up via an included analog cable with a 3.5mm plug. The sound driver inside each ear cup has been tuned to match the sonic signature of Audio-Technica’s previous model, and the built-in digital to analog converter further ensures a consistent sound, no matter what device is connected.