Product Comparison: Polar RC3 vs Polar M400

Advertiser Disclosure

This site is a free online resource that strives to offer helpful content and comparison features to its visitors. Please be advised that the operator of this site accepts advertising compensation from certain companies that appear on the site, and such compensation impacts the location and order in which the companies (and/or their products) are presented, and in some cases may also impact the scoring that is assigned to them. The scoring that appears on this site is determined by the site operator in its sole discretion, and should NOT be relied upon for accuracy purposes. In fact, Company/product listings on this page DO NOT imply endorsement by the site operator. Except as expressly set forth in our Terms of Use, all representations and warranties regarding the information presented on this page are disclaimed. The information which appears on this site is subject to change at any time. More info

General Specifications
About the Product
A smarter all-in-one. For recreational runners and cyclists who want integrated GPS with smart guidance.
Developed for runners who want a comfortable and durable running watch with sporty design and advanced GPS and training features. Track and record running as well as your other exercise, and monitor your performance accurately. Connect with the Polar Flow mobile app and stay active and motivated.
Key Specs
Display Type
Monochrome LCD
Display Size
1.3" x 1.3" (240 x 240 pixels)
0.94" x 0.94" (128 x 128 pixels)
Built-In GPS
Other Sensors
Accelerometer, Ambient light sensor, Gyroscope, Microphone, Heart rate sensor
Optical heart rate monitor
What customers say about "Key Specs"
Polar RC3 GPS with Heart Rate
  • I have made 12 runs with this watch & simply love this watch. I especially like the large screen which makes it easy to read the statistics while on the move.
  • It takes about 2s to get the heart rate signal & 30s to get the GPS signal which makes it ready to go when I complete my warm up. Decent device.
  • Its amazing how Polar made this integrated GPS watch so slim!
  • GPS connecting is so fast, much faster than my previous device!
  • Its amazing how fast GPS found my location, highly recommended!
Polar M400 GPS Smart Sports Watch
  • The GPS work perfectly & quickly & accurately 100% of the time but this device has a large, easy-to-understand, perfectly user-friendly display!!
  • Perfect GPS, very occurate, very stable!
  • I love that display, convinient size and good colors!
  • GPS is a little finicky at times, takes a while to lock into the signal and controls could be better.
  • I always have a GPS finding issues, so frustrated!
Size & Weight
1.7 in.
2.2 in.
1.4 in.
1.96 in.
0.5 in.
0.47 in.
2.2 oz.
1.7 oz.
Tracking Features
Distance, Speed, Pace, Route
Pace, Distance
Vibration Alerts
Clock Features
Alarm, Time/date
Time/date, Alarm
4GB internal storage + 512MB RAM
30 h training with GPS and heart rate depending on your language settings
What customers say about "Functionality"
Polar RC3 GPS with Heart Rate
  • Its super easy to use and has lots of great information during the run.
  • I found the watch very easy to setup and navigate between the menus.
  • If you want to ensure you train within a heart rate & pace range, this is definitely the watch for you.
  • Being able to load up my runs and see the map along with the pace and heart rate is fantastic. I can't wait to run my next race and analyze it.
  • The beep should be significantly louder or they should have included a vibration function.
Polar M400 GPS Smart Sports Watch
  • It is pretty cool. It gives you all kinds of info with maps, graphs, and charts.
  • This device records a ton of data and displays all of that data on the screen for you, and it even has a daily diary right on the screen.
  • The best part may be that I can set two interval timers to count down and alarm in continuous cycles, so I don't have to keep stopping and starting them during my run.
  • Like everyone else, I find the beep alerts hard to hear and wish it would vibrate, but I'm glancing down often enough that it isn't much of a problem.
  • The thing that I don't like is that it doesn't vibrate and it's kind of hard to hear it beep when Im running.
USB / Bluetooth
USB / Bluetooth
IOS, Android
Android, IOS
Water rating - 5 ATM
Wristband Material
Battery Type
250 mAH Li-Pol rechargeable battery
Rechargeable 240 mAh lithium polymer
Battery Life
Up to 12 hours in continuous use with the GPS function on
Battery duration up to 8 hours of training time with GPS and optical heart rate. Daily training session, continuous heart rate tracking and notifications: 5 days No training sessions, no notifications, continuous heart rate tracking: 14 days
Running Index, Training Benefit
Running Program, Running Index, Continuous Heart Rate, Smart Calories, Sleep Plus, Training Load, Recovery Status
What customers say about "Features"
Polar RC3 GPS with Heart Rate
  • The battery does not drain enough time, even using many functions.
  • I tried to swim in the pool with this watch and they continue to work, although IPX 7 does not allow swimming in water, amazing quality!
  • I like a battery lifetime, just try it!
  • Its only IPX 7 waterproof which means its safe to shower with or in a rainstorm but don't swim with it. Surprising for a sports watch.
  • Only down side is the IPX7 waterproof rating which means you can't jump into a pool for a swim after a long run.
Polar M400 GPS Smart Sports Watch
  • It has full support for the Mac computer, so you can plug it into your Mac, and it will sync to the Polar website.
  • Battery life is fantastic. I have never had trouble charging/syncing this watch.
  • I've been happy with battery life so far, it will generally last for a week of workouts no problem.
  • Battery life is pretty good, good purchase!
  • I have one complaint it's that the battery is only lasting 2-3 days.
Warranty / Certifications
Manufacturer Warranty
2 year(s)
2 year(s)
Other Information

Price History

Other reviews