The Audio-Technica ATH-M50xBT headphones add Bluetooth technology to the classic M50x studio headphones. This means studio quality in a portable design. With Bluetooth and a 45mm driver, ’ll hear all the frequencies in music like the artist intended. ’ll love the sound quality—from its crystal-clear highs to its deep accurate bass. It’s the same celebrated sound of the ATH-M50x headphones which are used in recording studios worldwide. The ATH-M50xBTs give 40 hours of continuous battery life on one charge. The battery is an internal polymer battery that recharges quickly using the included USB cable. The M50xBTs have a robust construction, 90° swiveling earcups, and professional-grade earpads and headband. They have a mic and button controls in the left earcup for phone calls, music playback and volume adjustment. They also feature a touch control in the earcup that is compatible with Siri or Google Assistant. If don’t want to use Bluetooth, the headphones come with a 3.9’ cable. The cable also has a mic and controls. When not in use, the headphones’ collapsible design allows them to be stored and transported easily in the included carrying pouch.