Price Match Guarantee JBL Tune 770NC Adaptive Noise Cancelling with Smart Ambient Wireless Over-Ear Headphones When your music is on, nothing else matters. The JBL Tune 770NC Adaptive Noise Cancelling wireless headphones deliver on that promise all day-and longer, while sparing you the unwanted noises. With up to 70 hours of battery life, you'll easily get through a busy week of using them and still have enough JBL Pure Bass Sound to get you through the weekend. And if you do need a quick rechar