JBL Live 770NC - Wireless Over-Ear Headphones with True Adaptive Noise Cancelling with Smart Ambient, Up to 65 Hours of Battery Life, Comfort-fit Fabric Headband & Carrying Pouch (Black): JBL Live 770NC headphones deliver powerful JBL Signature Sound in a comfortable over-ear headband style. When you're deep in your flow, 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