Image of a M400
Image of a Loop 2
Image of a Bip
Image of a VivoWatch
Image of a Charge
 PolarM400Remove Buy NowPolarLoop 2Remove Buy NowAmazfitBipRemove Buy NowAsusVivoWatchRemove Buy NowFitbitChargeRemove Buy Now

Basic Info

Suggested Price$200$120$99.99$160$130
Release20142015201820182014

Activity & Fitness

Calories
Cycling (Bicycling)
Distance
Heartn/an/a
Oxygen
Sleep
Steps
Swim

Battery

Duration8 hours to 30 days8 days (without notifications)30 days24 hours to 10 days7-10 days
Rechargeable

Compatibility

Android
iOS
Windows Phonen/an/aNANA
Macn/aNA
Windowsn/aNA

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color
Resolutionn/an/a176 x 176128 x 128NA
Sizen/an/a1.28 inchesNANA
TouchNA
Typen/aLEDNANAOLED

Functions

Audio SpeakerAlerts only
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or AltimeterNA
Ultraviolet Sensor
Water Resistance3 ATM2 ATMIP68IP671 ATM

Notifications

Phone
Emails
Texts

Software

Operating Systemn/an/aKoodOSNA
Apps
Music

All Wearables