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Fitbit Flex vs. Nokia (Withings) Go vs. Polar M400
Fitbit
Flex
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Nokia (Withings)
Go
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Polar
M400
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Basic Info
Suggested Price
$100
$80
$200
Release
2013
2016
2014
Activity & Fitness
Calories
Cycling (Bicycling)
Distance
Heart
VO2max (Oxygen)
Sleep
Steps
Swim
Battery
Duration
5 days
8 months
8 hours
Rechargeable
Compatibility
Android
iOS
Windows Phone
Mac
Windows
Connectivity
Bluetooth
Cellular
GPS
NFC
Wi-Fi
Display
Color
Resolution
n/a
128x128
Size
n/a
Touch
n/a
Type
LED
E-Ink
LCD
Functions
Audio Speaker
Alerts only
Clock
Phone
Vibration
Voice
Hardware
Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance
1 ATM
5 ATM
3 ATM
Notifications
Phone
Emails
Texts
Software
Operating System
n/a
n/a
Apps
Music
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