Sony Premium Bluetooth Lightweight Active Noise Canceling Headphones (Black) Active Noise Canceling - Designed to reduce up to 90% ambient noise when noise canceling circuit is activated Bluetooth Wireless - Enjoy high quality Bluetooth audio streaming and simplified connectivity with Near Field Communications (NFC) technology 30mm Driver Units - 30mm drivers with neodymium magnets deliver powerful bass and clear treble Designed for Comfort - Pressure-relieving cushions sit gently on your ears for a comfortable acoustic seal and powerful bass response. When not in use, the swivel ear cups fold flat and compact for enhanced portability Battery Life -The built-in rechargeable battery provides up to 29 hours of continuous, wireless music playback. For hands-free calling, you can speak freely for up to 29 hours or up to 150 hours of stand-by