Fitbit One
Tech specs 
Size48 mm x 19.3 mm x 9.65 mm (H x W x L)
MaterialThermoplastic. The clip is made of silicone and metal.
ChargingUSB
BatteryLithium-ion polymer
Battery life10-14 days / charge time: 1-2 hours
Water-resistanceSweat, rain and splash proof.
Weight8 grams
Sensor3-axis accelerometer, Altimeter, Vibration motor
DisplayOLED
Screen sizeN/A
ColorsBlack, Slate, Burgundy
Other
Activity tracking 
StepsYes
DistanceYes
CaloriesYes
ActivityYes
FloorsYes
SleepYes
Heart rate
Vo2Max
UV exposure
Skin temperature
Galvanic skin response
GPS
Running features
Swimming features
Smartphone notifications
Other Clock, silent wake alarm
Links 
View onAmazon | Best Buy | eBay
Amazon US rating4.3 out of 5 stars
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