Prana
Tech specs 
Size3.1cm x 0.6cm
Material
ChargingYes
Battery
Battery lifeUp to 7 days
Water-resistance
Weight
Sensor
Display
Screen size
Colors
Other
Activity tracking 
StepsYes
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 Tracks 10 distinct breath statistics and posture
Links 
View onPrana
Amazon US rating
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