Personal music sessions in public places often happen with one earbud in and one earbud out — this way you can hear others nearby and your music at the same time. That Batband is a far more attractive alternative, though it might get you a few sideways glances — it uses bone conductivity rather than traditional speakers, making it a so-called “ear-free” pair of headphones.

The company behind the device hails them as the first high fidelity bone conductivity headphones. Batband wraps about the back of one’s head, with each end piece being placed above the ears. The audio is conducted straight to the inner ear, then, so that you hear whatever is playing, as well as everything around you. It is controlled using a swiping pad and a button.
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https://www.slashgear.com/batband-headphones-an-ear-free-audio-headband-15404813/