Sony MDR-ZX770BN/B Bluetooth Noise Canceling Headphones w/Microphone NFC - Black (Certified Refurbished) Digital noise-cancelling technology reduces ambient noise from the outside, so you hear even more of the music you love.Wireless listening. Enjoy a tangle-free listening experience thanks to high-quality Bluetooth audio streaming with AAC and apt-X support.Easily connect to your devices. Access all of your favorite streaming services from your smart device to your headphones in a single touch with Near Field Communication (NFC).Hands-free calling. A built-in microphone makes hands-free phone calls a breeze. Once your phone is paired, simply press the phone button on the earpiece to accept incoming calls, and press it again to end the conversation.Up to 13 hours of music on a single charge.Built for superb sound.