Off-ear headphones have a lightweight construction and behind-the-neck band for a comfortable, secure fit Bluetooth connectivity allows for easy wireless connection to Bluetooth-enabled devices Designed for music playing with exceptional sound quality Lets you hear the world around you in addition to your music, allowing you to stay connected when running outdoors Built-in microphone allows you to take hands-free voice calls Water- and sweat-resistant construction enables use outdoors and while working out Rechargeable battery delivers up to ten hours of use on one charge, with a three-hour recharge time