Featuring Yamaha True Sound, the gray Yamaha TW-E5B True Wireless In-Ear Headphones combine 7mm dynamic drivers with precise engineering to deliver your music and other audio entertainment with acoustic detail and clarity. To help give you a personalized listening experience, even in public, Yamaha developed the TW-E5B with an original curved structure that gives you a tight seal and comfortable ergonomic fit. Additional features include the ability to let sound back in if needed, conduct crystal clear hands-free calls, enjoy audio at the gym, and more.