Quality sound combined with a secure fit, providing peace-of-mind that can define the difference between merely working out and pushing the limit. With 5 hours of Wireless Bluetooth-enabled wireless connectivity and JBL-quality sound, you can dig deep and push that much harder. Its distinctive, reflective-colored cord lights the way for night visibility, and its unique tether design allows customizable fits. Their sweat-proof, ready-for-anything, rugged design delivers on JBL's legendary sound – with no-compromise – moving you forward in more ways than one.