EASY LISTENING: Adjust the volume, change tracks and take calls with on-device touch controls. Enjoy added convenience with the proximity sensor that pauses playback when headphones are removed and resumes when placed back on. HYBRID ANC: These high-quality headphones feature hybrid ANC that reduces both high- and low-frequency background noises. Transparency Mode lets you tune back in to the outside world with a swipe of the touchpad. A SOUND EXPERIENCE: With the new bass port for deep sound and two dedicated microphones for enhanced voice call clarity, these Bluetooth headphones provide unparalleled Bang & Olufsen Signature Sound. FREEDOM TO MOVE: H9i wireless over-ear headphones can be paired with up to two devices at a time. An improved Bluetooth range of 121 feet lets you enjoy seamless streaming even when you aren't close to your music source. CONTINUAL MUSIC: Listen longer with these headphones that offer 18 hours of playtime while using Bluetooth and ANC, along with an intelligent battery saver and a replaceable battery to prolong playtime. Connectivity technology : Bluetooth 4.2 | Wired