The MDR-ZX770DC headphones provide 4 convenient listening solutions using the integrated Bluetooth®2 with NFC and digital noise cancellation technologies. For the ultimate experience, you can even listen to your aptX® & AAC audio files wirelessly with noise cancellation activated or use conventionally in passive mode without relying on the battery. Make or Take Calls. enjoy the convenience of hands-free calling thanks to the integrated microphone and Bluetooth®2 profile connectivity. Once your phone is paired, simply press the phone button on the earpiece to accept incoming calls then press again to terminate the call. Music playback will automatically resume once the call is completed. Up to 13 hours of music on a single charge. The internal, rechargeable battery provides up to 13 hours of continuous, wireless music playback with noise cancelling activated, up to 10 hours hands-free calling, or up to 150 hours of stand-by time.2 In between charges, passive mode allows continued listening to your favorite tunes, in a conventional fashion, using the supplied audio cable. Built for superb sound. 40mm driver units deliver broad, balanced, and accurate sound for an exceptional listening experience. Enjoy 20 – 20,000 Hz frequency response when streaming audio wirelessly via Bluetooth®1 or go all the way with extended frequency response (8 – 22,000 Hz) when using the supplied audio cable. Comfortable fit. Pressure-relieving cushions wrap around your ears for a comfortable acoustic seal and powerful bass response. And for when the music is over, the swivel ear cups fold flat and compact for enhanced portability. Supplied Accessories. a Padded Carrying Case, Accessory Pouch, a 1.5m Stereo Connecting Cable, Micro-USB cable, USB charger.