Bluetooth 4.1 technology enables wireless connectivity, JBL Pro Audio Sound delivers a dynamic listening experience, and ergonomic earpieces allow for unprecedented fit, and comfort in your ears. A rechargeable battery offers 8 hours of performance, and its built-in microphone with echo cancellation technology provides more natural sounding voice calls. Enjoy ultimate sound unbound. These headphones are ergonomically designed to fit the unique contour of your ears. You’ll experience unprecedented comfort. Listen longer and enjoy it more.