Designed to combine studio-quality sound with mobile convenience the ATH-M50xBT Wireless Over-Ear Headphones from Audio-Technica features sound reproduction from 45mm large-aperture drivers with rare-earth magnets and copper-clad aluminum wire voice coils. Together they are designed to provide both clear audio and rich deep bass. To help further enhance audio fidelity the M50xBT features padded noise-isolating earcups and aptX/AAC codec support. Audio is transmitted to the headphones wirelessly via Bluetooth technology. Built-in controls on the left earcup let you control the audio coming from your Bluetooth-compatible device. Use the built-in microphone and earcup buttons with your smartphone to answer and make hands-free calls. The buttons also control volume and music playback. With just a touch of the left earcup you can give voice commands or make requests of your mobile device s digital assistant software. Go Wired or Wireless The M50xBT wireless headphones have the added feature of a 3.5mm jack and include a 3.9 audio cable. If your battery is running low or you need to connect to a wired audio source you can convert the M50xBT into a pair of wired headphones. The 3.9 cable includes an in-line mic and controls so you won t lose the ability to manage your audio or conduct hands-free calls. Multi-Day Battery Life The built-in LiPo batteries have enough capacity to power the M50xBT headphones for up to 40 hours of continuous playback. When you finally do need to recharge just use the included 1 micro-USB charging cable. Collapsible Design In addition to the convenient 90#176; swivel earcups the M50xBT over-ear headphones features a collapsible design that helps to make it easy to throw them into the included pouch.