With its high-precision 11.8 mm drivers, the ATH-CKR75BT Sound Reality wireless in-ear headphones give you superb efficiency and audio quality with the convenience of Bluetooth wireless technology. These aren’t just any wireless headphones. The powerful drivers reproduce audio with an extended 5 - 40,000 Hz frequency response and they feature a built-in amplifier that enhances the sound’s depth and resolution. And since the headphones are compatible with aptX and AAC codecs (in addition to the standard SBC codec) the high-resolution drivers aren’t wasted on a low-quality wireless feed. Strong yet lightweight aluminum housings complete the package, greatly reducing unwanted resonance for crisp mid- and high-range reproduction. The headphones also feature 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. The ATH-CKR75BT’s behind-the-neck design conveniently situates the mic and controls for easy access. Also included are four sizes (XS, S, M, L) of interchangeable ear tips, 30 cm (11.8") USB charging cable, secure-fit battery clip and a carrying case. *The Bluetooth word mark and logos are owned by Bluetooth SIG, Inc. and any use of such marks by Audio-Technica Corporation is under license. Other trademarks and trade names are those of their respective owners.