JBL Live 770NC headphones deliver powerful JBL Signature Sound in a comfortable over-ear headband style. True Adaptive Noise Cancelling with Smart Ambient technology keeps you free from distractions. Or, if you want to keep an ear open to the world around you, you can even have a conversation without taking the headphones off. Enjoy 65 hours (50 hours with BT+ANC on) of music streaming. A 5-minute speed charge gets you another four hours. The JBL Live 770NC can connect with two Bluetooth® devices simultaneously, so youll never have to miss a call even if youre watching a movie on your tablet.