1 Lithium ion batteries required.

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Advanced Noise Cancellation Technology: Whether you’re commuting on the subway, escaping the distractions of an open office, or tuning out a roommate’s noisy TV Show, E7 Active Noise Cancellation helps you create your own quiet space. The active noise canceling function filters out unwanted noise so all you hear is your music.
Wireless Hand-Free Calls: Audonia E7 Bluetooth headphones come with a built-in mic for clear hands-free calls. When you are talking on the phone or having a remote class, just turn on the Bluetooth and ANC mode, these headphones will pair in a short time. No more of those annoying noises, so you can focus yourself on what you are doing.

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Reference class open back, dynamic headphone employing new and improved transducers delivering low harmonic distortion
Transducers are hand selected for precise (1 dB) left / right matching tolerance insure exceptional accuracy and presentation of stereo spatial characteristics