Designed to combine studio-quality sound with mobile convenience, theATH-M50xBT Wireless Over-Ear Headphonesfrom - Audio-Technicafeatures 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 M50x - BT features padded noise-isolating earcups, and apt - X/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 M50x - BT 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 M50x - BT 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 Li - Po batteries have enough capacity to power the M50x - BT 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 swivel earcups, the M50x - BT over-ear headphones features a collapsible design that helps to make it easy to throw them into the included pouch. Product Highlights 45mm Large-Aperture Drivers Built-In Rechargeable Battery Up to 40 Hours of Playback 90 Swivel Earcups Wireless Bluetooth Technology Built-In Microphone for Hands-Free Calls Voice Assistant Access via Touch Control Built-In Buttons for Call/Music Control Collapsible Design for Portability Includes 3.9' Stereo Connector Cable