Product Comparison: Polar A300 vs Polar M400

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General Specifications
About the Product
The A300 tracks your moves 24/7. It shows your steps, distance, and burned calories. Let the A300 guide you and show you different ways to reach your daily goal.
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
Monochrome LCD
Display Size
1.0" x 0.6" (64 x 28 pixels)
0.94" x 0.94" (128 x 128 pixels)
Built-In GPS
Other Sensors
Heart rate sensor
Optical heart rate monitor
What customers say about "Key Specs"
Polar A300 Fitness Tracker and Activity Monitor
  • Large display that allows easy navigation through use of the buttons.
  • The display is readable under very broad brightness range. It has a light-up button too.
  • Good display, even when I run at high speed I can still read everything.
  • My old device would keep and display totals until I cleared them. Not this device. It only shows each activity's stats.
  • And the number of steps doesn't appear on the display, but has to be searched for with the menus.
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
2 in.
2.2 in.
1.5 in.
1.96 in.
0.5 in.
0.47 in.
1.7 oz.
1.7 oz.
Tracking Features
Pace, Speed, Time
Pace, Distance
Vibration Alerts
Clock Features
Time/date, Alarm
Time/date, Alarm
60 h training
30 h training with GPS and heart rate depending on your language settings
What customers say about "Functionality"
Polar A300 Fitness Tracker and Activity Monitor
  • The time and date are always displayed on the Polar A300; it does not require some elaborate wrist movement to may the display turn on.
  • It alerts you if you've been sitting too long and has smart features such as email, text, and phone call alerting.
  • I have been wearing the watch at night to get a glimpse into my sleeping patterns. It does that well and the alarm seems to do a great job of getting me up.
  • Alarms work great, no bugs, no lags, so good!
  • Like the functionality, so many different configurations!
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
Rechargeable Lithium Polymer
Rechargeable 240 mAh lithium polymer
Battery Life
Up to 26 days with 24/7 activity tracking and 1h/day train
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
24/7 activity tracking, Sleep quality tracking, Vibrating smart notifications, Inactivity alerts, Changeable color wristbands
Running Program, Running Index, Continuous Heart Rate, Smart Calories, Sleep Plus, Training Load, Recovery Status
What customers say about "Features"
Polar A300 Fitness Tracker and Activity Monitor
  • The Polar A300 does vibrate when your phone is getting a notification, text, or call.
  • The battery life is still so much better than the other activity trackers!
  • Good quality, a like that is wateproof, really like.
  • Device has a nice battery, no complains about it.
  • Smart notifications are really helpful thing, recommended!
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

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