Polar M400 vs Polar RS300X

Polar M400 Polar RS300X

Basic Info

Wear TypeWristbandWristband
Price$18000$18998Polar M400 is 110% cheaper

Activity & Fitness

Activity Yes YesBoth track daily activity
Calories Yes YesBoth show estimated calories burned
Sleep Yes NoPolar M400 monitors your sleep pattern
Heart Rate / Pulse No YesPolar RS300X has the heart rate monitoring sensor
External HR Monitor Yes No
VO2 Max Yes NoPolar M400 shows the maximum volume of oxygen you can consume per minute
Distance Yes YesBoth track your stride length
Steps Yes YesBoth track and count your steps
Pace Yes No
Stairs / Floors Yes NoPolar M400 has built-in altimeter for elevation feature
Exercise Tagging No YesOnly Polar RS300X provides exercise tagging
Smart Coach Yes YesBoth can help with smart coaching
Goal Setting Yes YesBoth can help with your goals setting
Inactivity Alert Yes NoPolar M400 helps you stay active with inactivity alert

Additional Features

GPS Yes YesBoth have integrated GPS modules
Compass No NoBoth don't have a compass
Watch / Clock Yes YesBoth have watch
Alarm Clock Yes YesBoth have alarm clock
Reminders Yes NoPolar M400 has a reminder option
Stopwatch No NoBoth don't have stopwatch
Music Playback No NoBoth don't have music playback
ReportsActivity, SleepActivity

Smartphone Remote Features

Notifications Yes NoIf you get a phone notification, Polar M400 make an alert for you
Caller ID Yes NoPolar M400 can notify you who is calling
Music Control No NoBoth don't have phone music control
Call Control Yes NoPolar M400 allows you control phone calls
Camera Control No NoBoth don't have camera control
Find Phone No NoBoth don't have a find phone feature


Duration24 days365 daysPolar RS300X battery life is about 15.2 times longer
Battery TypeRechargeable BatteryReplaceable Cell Battery

Physical Specs

Weather Resistance Yes Yes
Waterproof No Yes
IP Rating3 ATMn/a
Weight57 grams181 gramsPolar M400 is 124.0 g lighter

User Interface

Display Yes Yes
Display Sizen/an/a
Screen Resolution 128 x 128 pixels n/a
Color Display No No
Touch Screen No No


Android Yes NoPolar M400 is compatibles with Android phones and tablets
iOS Yes NoPolar M400 can connect with iPhones or iPads
OS X/Mac Yes YesBoth compatible MAC OS X laptops and PCs
Windows Phone Yes NoPolar M400 compatibles with a range of Windows Phone devices
Windows Yes YesBoth can help find your smartphone
Web Portal Yes YesBoth have access to online web portal
Social Features Yes NoYou can integrate Polar M400 with social networks and share information


Bluetooth Yes NoOnly Polar M400 has a built-in Bluetooth connection option
Wi-Fi No NoBoth don't have Wi-Fi connection
NFC No NoBoth don't have NFC connectivity
ANT+ No NoBoth don't provide ANT+ wireless technology
Buy on AmazonBuy on Amazon

Polar M400

Polar RS300X