Muse
Tech specs 
Size
MaterialPlastic
ChargingMicro USB
Battery
Battery lifeA fully charged battery lasts for up to 4+ hours of continuous use.
Water-resistance
Weight
SensorMuse has 7 EEG sensors – 2 on the forehead, 2 behind the ears plus 3 reference sensors – which detect and measure the activity of your brain.
DisplayLED
Screen size
Colors
Other
Activity tracking 
Steps
Distance
Calories
Activity
Floors
Sleep
Heart rate
Vo2Max
Stress & recoveryYes
UV exposure
Skin temperature
Galvanic skin response
GPS
Running features
Swimming features
Smartphone notifications
Other Muse is your personal meditation assistant. While you meditate, Muse measures whether your mind is calm or active, and translates that data into weather sounds. When you’re calm, you’ll hear peaceful weather sounds. When your mind wanders, the weather will intensify, guiding you back to a calm state. After each session, review your data, set goals, and build a deeply rewarding meditation practice that gets better every time.
Links 
View onAmazon
Amazon US rating3.4out of 5 stars
Read moreArticle