It now gives you feedback on heart rate, breathing and movement

Muse has announced a new meditation headband – the Muse 2 – a portable electroencephalograph (EEG) device that tracks brain waves to help guide you into a meditative state.

Muse’s first headband, which launched in 2014, converted this EEG signal into sounds reflecting the real-time state of your brain. The idea was that the headband would help you reach a deep relaxed state – but for some people the auditory cues weren’t enough to “switch off” from the outside world.
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https://www.wareable.com/health-and-wellbeing/muse-2-headband-release-date-price-features-6666