Polar M400 vs. Asus ZenWatch vs. Amazfit T-Rex

 
M400
ZenWatch
T-Rex
 PolarM400Remove Buy NowAsusZenWatchRemove Buy NowAmazfitT-RexRemove Buy Now

Basic Info

Suggested Price$200$150$140
Release201420142019

Activity & Fitness

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

Battery

Duration8 hours to 30 daysNA20 days
Rechargeable

Compatibility

Android
iOS
Windows Phonen/aNA
MacNA
WindowsNA

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color
Resolutionn/a320 x 320360 x 360
Sizen/a1.63 inches1.3 inches
Touch
Typen/aAMOLEDAMOLED

Functions

Audio SpeakerAlerts only
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance3 ATMIP555 ATM

Notifications

Phone
EmailsNA
TextsNA

Software

Operating Systemn/aAndroid WearBuild-in
Apps
Music

All Wearables