Bose designed these wireless Bluetooth earbuds to make your workouts the best they have ever been. Note: You might not get the right sound quality or call performance if the earbud tips' sizes don't match your ear canals' sizes or if the headset isn't worn correctly in your ears. Replace the earbud tips with ones that slide into your ears more securely. The item Note: You might not get the right sound quality or call performance if the earbud tips' sizes don't match your ear canals' sizes or if the headset isn't worn correctly in your ears. Replace the earbud tips with ones that slide into your ears more securely. Bose realistic sound: gives the impression that the performer is correct in your music.