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Muse is a wearable brain sensing headband. The device measures brain activity via 4 electroencephalography (EEG) sensors. An accompanying mobile app converts the EEG signal into audio feedback that is fed to the user via headphones. Muse is manufactured by InteraXon, a company based in Toronto, Ontario, Canada that was founded by Ariel Garten, Trevor Coleman, and Chris Aimone. Development of the Muse product began in 2003, and after several rounds of fundraising, was released to the public in May 2014.
The device operates by representing brain waves that correspond to a more relaxed state through the sound of tweeting birds, and higher amounts of brain activity is represented by storm sounds. It is claimed that using the headband helps in reaching a deep relaxed state.
Muse is worn over the ears and connects to a companion mobile app via bluetooth. The use of Muse enables the use of biofeedback, differing from a device like Thync that claims to actually alter brainwaves by wearing it.
Muse is the subject of various scientific studies, one of those at the Mayo Clinic, to understand its usefulness in supporting patients who have undergone breast cancer surgery.

Source: Wikipedia