Xiaomi Mi Band 2
Tech specs 
Size15.7mm x 10.5mm x 40.3mm (W x D x H)
MaterialHypoallergenic silicone band
ChargingYes
Battery70 mAh battery
Battery lifeUp to 20 days
Water-resistanceSplash proof (IP67)
Weight7 grams
SensorADI ultra-low power acceleration sensors and optical heart rate sensor
DisplayOLED Display
Screen size0.42"
ColorsBlack, Blue, Green and Orange
Other
Activity tracking 
StepsYes
DistanceYes
CaloriesYes
ActivityYes
Floors
SleepYes
Heart rateYes
Vo2Max
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
GPS
Running features
Swimming features
Smartphone notificationsYes
Other
Links 
View onAmazon
Amazon US rating3.9 out of 5 stars
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