Sony MDR-ZX330BT/B Bluetooth Wireless On-Ear Headphones w/Microphone NFC - Black (Certified Refurbished) 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 30 hours of music on a single charge. The built-in rechargeable battery provides up to 30 hours of continuous, wireless music playback. For hands-free calling, you can speak freely for up to 30 hours or up to 300 hours of stand-by.Comfortable fit.