Escape into immersive audio and feel a deeper connection to your music with the Bose QuietComfort Noise Cancelling Bluetooth Wireless Earbuds II, featuring the world’s best noise cancellation and pioneering CustomTune sound calibration technology that intelligently personalizes the noise cancellation and sound performance to your ears. To ensure all-day comfort and a secure fit for your unique ear shape, these in-ear headphones come with a Bose Fit Kit that contains three different sizes of ear tips and stability bands, all made from soft silicone. With the Bose QuietComfort Active Noise Cancelling Earbuds II, you control how much of the outside world you want to let in, alternating between Quiet Mode for maximum noise cancellation and Aware Mode with ActiveSense Technology to keep a pulse on your surroundings. Stay in the zone with the simple touch interface that lets you control music, answer calls, and change the noise cancellation level directly on the wireless earphones, and make your voice heard with the noise-rejecting microphones that focus on the sound of your voice and filter out ambient noise and wind. With the single earbud listening feature, you can take out the left or the right earbud and still hear your music or call with the other bud without interruption. These true wireless earbuds let you stay absorbed in your favorite songs, podcasts or audiobooks for up to 6 hours on a single charge, and the convenient charging case – which easily fits into pockets, purses and gym bags – holds three additional 6-hour charges. The Bose QuietComfort Wireless Bluetooth Earbuds II are powered by advanced Bluetooth 5.3 capability so you can enjoy a continuous connection to your favorite music within 30 feet of your paired device, and they have an IPX4 environmental rating for sweat and water resistance so they can handle most drips, sprays and splashes.