Bose QuietComfort Ultra Headphones 2nd Gen Desert Gold (890101-0400) is a premium over-ear wireless headphone designed for everyday use and travel. CustomTune technology adapts the sound to the shape of your ears for a more personalized and high-quality audio experience. Quiet Mode delivers the best noise cancellation, while Aware Mode lets you hear your surroundings. Soft ear cushions and an evenly balanced headband ensure long-lasting comfort. Battery life reaches up to 30 hours in Quiet and Aware Mode (23 hours with Immersive Audio), with support for listening while charging. Optional wired listening provides crystal-clear lossless audio. The Bose app allows full customization of EQ settings and shortcuts.