Muse 2 is a training tool to help you improve your meditation practice. The Muse: Meditation and Sleep app that works in tandem with the headband is available for free with Apple Store and for Google Play Store. Connect your charged Muse 2 headband to your app via Bluetooth, fit it comfortably and put on your favorite headphones.
https://www.amazon.com/Muse-2-Brain-Sensing-Headband/dp/B07HL2S9JQ