Bluetooth technology and a multi-foldable design for ultimate portability. _x000D_ Features up to 22 hours of rechargeable battery life and a backup aux cable for continued listening if the batteries low. _x000D_ Rapid charge technology gives you 90 min. Of listening after just 5 min. Of charging. _x000D_ Custom-tuned, 40mm drivers combine with a digital amplifier and noise-isolating fit for-best-in-class Audio _x000D_ Voice prompts for low battery and pairing assistance. On-ear buttons allow for call, track, volume control.