With Sennheiser's in-ear headphones, you can listen to your favorite music, anytime, anywhere. You can choose from wired, wireless, and fully wireless headphones. The difference between wireless and fully wireless headphones is the neckband. You don't have any with fully wireless headphones. Do you travel often? We recommend Sennheiser noise-canceling in-ear headphones. Noise canceling is a technology that reduces ambient noise. Ambient noise is measured, filtered, and sent back via the headphones. Do you prefer a cable? Choose a wired version.