Take Sound Reality on the go. The ATH-CKR35BT in-ear headphones feature Bluetooth® wireless technology along with an in-line mic and controls, allowing you to answer calls, adjust volume and handle playback of music and videos on compatible smartphones and other devices. Take Sound Reality on the go. The ATH-CKR35BT in-ear headphones feature Bluetooth® wireless technology along with an in-line mic and controls, allowing you to answer calls, adjust volume and handle playback of music and videos on compatible smartphones and other devices. And with the headphones’ high-performance 9.8 mm drivers and vibration-absorbing brass stabilizers you’re assured true-to-life audio with remarkably clear mid and high frequencies. The headphones feature compact housings designed to fit comfortably in anyone’s ears and provide a high level of sound isolation – a fit enhanced by four sizes (XS, S, M, L) of interchangeable eartips. The in-line mic and controls are part of a comfortable behind-the-neck cord design that places the battery case on the upper back where, if desired, it can be attached to your shirt collar with the included clip. Also included are a 30 cm (11.8") USB charging cable and a protective pouch.