Jaybird X2 Sport Wireless Bluetooth Headphones The midnight black X2 Sport In-Ear Headphones from JayBird are designed to provide wired sound quality over Bluetooth wireless streaming, employing JayBird’s proprietary SBC codec, Shift. The headphones are sweat-proof and feature a secure fit for active use. The X2 can be worn either over or under-ear, and have an integrated microphone and remote for taking calls, controlling playback, and interacting with their voice-prompt system, Jenna. A built-in rechargeable battery provides up to 8 hours of use, and can be charged with the included micro-USB cable. The X2 ships with three pairs of ear tips, three pairs of ear cushions, two X-Fit cord management clips, and a protective carry case. Shift SBC Bluetooth Codec Shift Premium Bluetooth Audio is a codec developed by Jaybird for decoding the audio with an enhanced bit rate. The result is crystal clear Bluetooth audio, which rivals leading wired headphones Tuned for Studio-Quality Performance Considerable time was spent in the studio, doing extensive sound matching to bring out the right levels and the quality of sound the recording artists intend for you to hear PureSound Reduces Listener Fatigue PureSound filters out and eliminates white noise, delivering a clean audio experience, offering hours of pure enjoyment while eliminating listener fatigue Secure Fit for Sports X2 patented sports ear fins hug into the top, back & lower surface areas of the ear, all essential to lock in for sports. Jaybird offers the very best in secure-fit Bluetooth headphones for wherever your active life takes you