Note : If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ear Newly developed 9 mm drivers deliver clear, full-range audio with the punch of enhanced bass Best-in-class battery life with up to 20 hours of continuous playback on a full charge (and up to 90 minutes of use from a 10-minute quick charge) Multipoint pairing function allows you to stay connected to two Bluetooth devices at once Buttons in the earbuds provide easy control of music playback, volume, calls, and hear-through and noise-cancelling functions Low latency mode improves synchronicity between audio and video for smooth streaming and gaming