Polar M400 vs. Garmin Forerunner 45 vs. Xiaomi Mi Band 4

 
M400
Forerunner 45
Mi Band 4
 PolarM400Remove Buy NowGarminForerunner 45Remove Buy NowXiaomiMi Band 4Remove Buy Now

Basic Info

Suggested Price$200$199$25
Release201420192019

Activity & Fitness

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

Battery

Duration8 hours to 30 days7 days20 days
Rechargeable

Compatibility

Android
iOS
Windows Phonen/a
Mac
Windows

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color
Resolutionn/a208 x 208120x240
Sizen/a1.04 inches0.95 inches
Touch
Typen/aLCDAMOLED

Functions

Audio SpeakerAlerts only
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance3 ATM5 ATM5 ATM

Notifications

Phone
Emails
Texts

Software

Operating Systemn/aBuilt-inAMAZFIT OS
Apps
Music

All Wearables