SONY WH-XB910N with 30Hrs Battery Life, Active Noise Cancellation enabled Bluetooth Headset (Blue, On the Ear). With feedforward and feedback mics on each side, WH-XB910N takes digital noise cancelling to the next level. The WH-XB910N Headphones enhance all your low-end frequencies for exceptional bass. With up to 30 hours of battery life, you?ll have enough power for multi-day road trips and long festival weekends. And if you need to top up in a hurry, a 10-minute quick charge gives you up to 4.5 hours of extra play time with the optional AC adapter. These headphones can be paired with two Bluetooth devices at the same time. So when a call comes in, your headphones know which device is ringing and connect to the right one automatically. Quickly and smoothly switch your headphones to either of the two devices at the touch of a button. Place your hand over the right ear cup to turn the volume down and deactivate noise canceling for instant conversation. Change track, adjust volume, and take or make calls by tapping or swiping the touch panel on the side of your headphones. Conversation flows freely with easy hands-free calling, now clearer than ever with a high-quality built-in microphone. DSEE restores high frequency sounds lost in compression.