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Stable connectivity and smooth transmission in high speed and long distance. Built-in HD stereo speaker, microphone, and volume control buttons for hands-free clear calling, answering phone calls, and handling previous/next songs without having to use your phone or additional headphones Based on ergonomics, onaEz sleep headphones Bluetooth sleeping eye space is wider and deeper than other flat eye mask. The eye socket design with plenty of space makes your eyes blink freely and never touches your. The eyelashes/eyelids/eye make-up Devices module is in the middle of the speakers, won’t press the ears, which is very comfortable for side sleepers. The ultra-thin, flat headphone speakers are comfortable enough to wear while lying down or sleeping on your side. They block out ambient noise without using earplugs that are painful & fall out