Bose QuietComfort Ultra Wireless Earbuds Noise Cancelling Bluetooth Headphones deliver breakthrough spacialized audio personalized sound and world-class noise cancelling. These are the ultimate earbud experience. Enjoy a more immersive listening experience making your music feel more real than ever before. The QC Ultra Earbuds uses CustomTune technology that adapts the sound to your ear s unique shape for personalized sound. The QuietComfort Ultra Noise Cancelling Earbuds gives you the perfect fit with nine combinations of eartip and stability band sizes. Enjoy your favorite music longer with six hours of listening time and the included case holds up to three more charges too. Get a strong connection to your paired devices with Advanced Bluetooth 5.3 and the Bose Music App shows what you have paired. It also walks you through the setup and helps you customize your controls for the best listening experience.