Enjoy your music without the wires and block out unwanted external sound with Sony's CH700N headphones. They connect to your smart device via Bluetooth or NFC for a wonderful wireless listen, while Artificial Intelligence Noise Cancellation lets you get fully immersed in your sounds without distraction. You can take phone calls and interact with your phone's virtual assistant with ease, and they offer up to 35 hours of supremely comfortable listening. Artificial Intelligence Noise Cancellation Sony's AINC blocks out unwanted exterior noise so it's just you and the music. Read more… And it adapts to your environment for optimum performance wherever you are. Just press and hold the NC button to easily activate when you need it. Simple Wireless Connection Enjoy the benefit of unrestricted listening and lose the cables with Near Field Communication (NFC). Using NFC the headphones are able to connect to your smart device with just one touch, or via simple Bluetooth, and with no wires in sight. Recharging via USB cable, the battery lasts up to a whopping 35 hours to keep you immersed in wireless noise-cancelled music all day, all night, and beyond. And should the battery run out, keep listening by plugging in the included audio cable in traditional fashion. Superb Sony Sound Enjoy Sony sound quality with 40mm dome drivers for dynamic, crisp and detailed audio. Bass is deep and powerful within a wide frequency range. DSEE (digital sound enhancement engine) boosts the quality of compressed music files for high quality audio that's closer to the original recording. Convenient Calls & Voice Assistant Control Take phone calls with ease using the built-in high-quality microphone, or voice-interact with your smart phone's voice assistant without needing to get your phone out. Via buttons on the ear-piece, you can also control music playback and volume. Comfortable Design An adjustable slider headband and soft cushioned ear-pads ensure long-lasting comfort for those extended listens. And the ear-cups swivel to a flattened position for easy storage and travel.