Bose QuietComfort Ultra Earbuds I am selling these as I no longer use them. There are absolutely no issues with their functionality. Purchased in 2024, used infrequently, and the battery has not degraded much. They were used with a cover, so there are almost no scratches or stains. Only the small (S) ear tips were used; the other sizes are unused. ※ These are the first generation. ※ These are used, but I will also send the silicone case along with them. (Please let me know if you don't need it) Thank you for your consideration. ● Experience audio that goes beyond "listening" to "feeling" Experience music more realistically than ever before. Groundbreaking Bose Immersive Audio delivers a more immersive sound experience regardless of content or source. World-class noise cancellation and customized sound performance. We've also focused on the fit. Once you hear this sound, you'll immediately understand its appeal. ● Immersive audio. Everything is more real. Bose Immersive Audio pushes the boundaries of listening. It creates an immersive listening experience as if the sound is unfolding right in front of you. You can feel like you're sitting in a VIP seat at a concert hall. For those seeking overwhelmingly realistic sound that you can almost reach out and touch. Enjoy a listening experience like never before, where the sound resonates naturally. ● World-class noise cancellation and customized sound performance The magic of CustomTune technology. This technology analyzes the shape of your ear and optimizes the sound and active noise cancellation to match, achieving world-class noise cancellation and customized sound performance. Rediscover the excitement and thrill of hearing your favorite songs for the first time. ● Mode selection to match the scene and mood When you want to shut out the surrounding noise and focus on music or work, use Quiet Mode. You can experience world-class noise cancellation. If you want to enjoy content while paying attention to your surroundings, switch to Aware Mode, allowing you to hear the sounds around you and have conversations without removing your earbuds.