Bose QuietComfort Earbuds II are engineered with pioneering CustomTune sound calibration technology that personalizes the audio to your ears, so you can enjoy world-leading noise cancellation and deep, immersive sound wherever you're listening to music.Engineered with pioneering Bose CustomTune technology, QC Earbuds II personalize the audio to fit your ears. When noise cancellation and sound performance are tailored to you, your music is more engaging, allowing you to feel a deeper connection to whatever you're listening to.Bose QuietComfort Earbuds II are a sleek, versatile musical companion designed to fit you and everything you do. Engineered with pioneering CustomTune sound calibration technology, these wireless earbuds personalize the noise cancellation and sound performance to fit your ears, so you get the world's best noise cancellation and deep, immersive sound with powerful bass whether you're at home or on the go.To ensure all-day comfort and a secure fit, the earbuds come with the Bose Fit Kit that includes 3 different soft, silicone ear tips and 3 different stability bands to mix and match to find your best fit. With a compact, lightweight design, you will almost forget you're wearing them. Easily control your music or adjust your preferred level of noise cancellation with the earbud's simple touch controls. Phone calls sound crystal clear. Listen for up to 6 hours on a single charge. The charging case holds 3 additional 6-hour charges for