Polar M400 - Reviews, Prices, Specs and Alternatives

Polar M400

Polar M400
$204.99 View deals
Price updated 12 hours ago

Compare Polar M400 with:

Garmin Vívosmart HR+
Garmin Vívosmart HR+
Fitbit Charge 2
Fitbit Charge 2
Polar A370
Polar A370
Other Fitness Tracker
Review by Sophia 0 0
The Polar M400 is the fitness-focused watch and an activity tracker that is designed specifically for runners. It was released by Polar in wearable band from Polar in 2014. What's unique about the M40... Read full review
Avg. review
  • GPS WATCH: Built-in GPS technology keeps track of your pace, distance and altitude
  • FITNESS TRACKER: Tracks your workouts, steps, distance, calories burned, sleep quality, and activity 24/9
  • WATERPROOF FITNESS TRAINER: Use the fitness tracking watch to keep an eye on your running cadence to improve your running efficiency and avoid injuries in all weather conditions
  • ADVANCED TECHNOLOGY: Compatible with H7 Heart Rate sensor to train at the right intensity with target heart rate zones
  • SOCIAL SMARTWATCH: Plan, sync and share your training using the Polar Flow app and web service
  • Read more
Physical Features
Color Mouse over a color for a picture
Style At first, fitness trackers were designed more for function than fashion, as they were geared towards fitness buffs to wear when exercising, so style wasn’t really a concern. Since then, fitness tracke ... Show more
On the Wrist
5 x 4 x 4 inches

0.3 oz
Size Variations Mouse over a size variation for a picture
Syncs Data Automatically The way that your tracker stores and syncs data is hugely important to the experience you have with your device. The most convenient trackers will sync data automatically and wirelessly to your smartp ... Show more
Compatibility What software platforms are compatible with it?
  • iOS 8.0 or later
  • Android 4.3 or later
Third Party App Integration Getting the full picture of your health requires input from other sources other than the app associated with your tracker - tracking fitness is only part of living a healthy lifestyle. This might incl ... Show more
Polar Flow mobile app
Activity Detection The most basic fitness trackers measure steps, distance and calories... your general fitness needs. Beyond that, some will also detect when you are exercising, based on your heart rate and movements. ... Show more
  • Walking
  • Running
Sleep Tracking
Sleep Tracking Like activity tracking, sleep tracking is a common feature for most fitness trackers with much variation. The main difference between trackers is whether or not sleep is tracked automatically or manua ... Show more
Advanced Sleep Metrics For devices that do track sleep, the quality of the metrics recorded varies. Some devices simply record the number of hours that you were asleep. Others go farther and tell you when you were in light, ... Show more
Sleep duration, stages (deep or light sleep) and pattern
Alarms & Reminders A small, but still significant, feature of fitness trackers is the ability set alarms or reminders. First, there are alarms to wake you up in the morning. Usually, these are silent, vibrating alarms o ... Show more
Premium Features
Water Resistant Fitness trackers are available at varying levels of water resistance. Some can’t get wet at all; some can be worn while you swim or shower. Trackers that are listed as “splash proof” can’t really get ... Show more
3 ATM - Rain, splashing, accidental submersion and showering. No swimming.
Heart-Rate Tracking Because you’re supposed to wear a fitness tracker all day, tracking your heart rate provides you with extremely valuable metrics. First, your resting heart rate is an indicator of how healthy you are. ... Show more
Automatic - Optical
GPS For the more advanced athlete, a GPS-enabled fitness tracker is a must. Regular devices cannot track pace, intervals, elevation, or even distance accurately—stats that are hugely important to avid run ... Show more
Music Player A much less common feature, but still notable, is the potential to upload and store music on your fitness tracker. This can only be found on the most advanced trackers (and thus will come with a large ... Show more

The type of display or screen on fitness trackers varies widely by brand and price point—from a few LED lights to full color touchscreens. The main benefit of a screen is being able to read the time and your fitness stats any time of the day without needing to open an app on your phone or plug the tracker into your computer. This could be a positive or negative—some people prefer not to see progress and feel rewarded when they finally look at results and meet their goal. Others need a constant reminder of their status to push them to reach their goals. It’s totally up to you.

Oftentimes, you can also read smartphone notifications on a screen, depending on how advanced the tracker is. Every tracker will differ on what information is shown on the display, whether it’s the time, steps, heart rate, or other goals. Some will be a touchscreen, some will not. These aspects mainly affect ease of use, and will vary in importance by person. Finally, a display will also drain your battery more quickly, and come with a higher price tag.

Display Does the tracker have a screen?
Black & White Display
Touchscreen Is the display a touchscreen?
Smartphone Notifications As fitness trackers become more advanced, and as smart watches become more popular, the lines between the two are blurring, especially when it comes to linked capabilities between the device and your ... Show more

For fitness trackers, batteries vary widely. Some trackers have rechargeable batteries that last anywhere from hours to days. Others take coin cell batteries like you would find a regular watch, which last a few months to a year. Needing to purchase and replace batteries can be a hassle… but so can plugging in your device every five or so days via USB cable to recharge it. Remembering to take the device off, charge it, and then remembering to put it back on, can seriously interrupt your fitness routine, especially if you’re worried you’ll forget it. Plys, if you want consistent sleep tracking, you don’t want to be charging it overnight. Both options have advantages and disadvantages to keep in mind while you compare options.

Battery Life How long does the battery last?
30 days
30 days for daily activity monitoring; 8 days for GPS recording and heart rate tracking
Type of Battery
Additional Features Any other features to note.
  • Free web and app services
  • Sedentary reminder
Popularity 0-100 scale indicating how frequently people buy the product online. Recalculated daily.
89 / 100
Release Date
Model Numbers Mouse over a model for a picture
2-Year Warranty

Price Range:

Key features
  • Tracks heart rate, sleep quality, calories burned, daily fitness activity, and GPS.
  • Customized sport profiles
  • Running program and index
  • Individual training targets.
  • Smart notifications

Polar M400 is a very popular option at the top of the price range. It's in the top 3 bestselling fitness trackers and has a couple of popular alternatives in the same price range, such as Microsoft Band 2 or Polar M430 GPS .

Polar M400 was released in 2016. There are dozens of newer fitness trackers on the market. Show newer Fitness Trackers

Polar M400 is $167 more expensive than the average fitness tracker ($37.99).

Customer Reviews Reviews from real customers who bought the product on Amazon

Questions about Polar M400

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track calories
Related: Polar M400, Polar FT60, Fitness Trackers | Submitted by John 140 days ago

Both the Polar M400, and Polar FT60 have the ability to track calories, as do most fitness trackers for that matter, so either one would fit that requirement decently. It would help to know what sort of other features you would be interested in to make a wise choice. They both have a few differences, such as the Polar M400 having automatic sleep tracking, and the Polar FT60 having a longer battery life.

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Hello, I have M400. What is the difference between that and A360?
Related: Polar A360, Polar M400, Fitness Trackers | Submitted by anonymous 411 days ago

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I really like the Polar m400 for the external HR monitor (H7) but also really want a watch/tracker that has a silent alarm mainly for the ability for it to wake me up in a light sleep cycle. Are there any other brands you recommend with same features as the m400 but with the silent alarm function?
Related: Polar M400, Fitness Trackers | Submitted by anonymous 524 days ago

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Questions about other Fitness Trackers

There are 55 questions about Fitness Trackers. Ask a question Show all

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Hi . Just received my tracking plugged it in to charge nothing on the display .
How long does it need to charge ?
When will i see anything on the display to know it is okay to use ?
Related: Fitness Trackers | Submitted by anonymous 4 days ago

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Can you add a wristband to omron hj320?
Related: Omron Alvita HJ-320, Stardrift Smart Wristband, Fitness Trackers | Submitted by anonymous 21 days ago

No, this device is meant to clip on your waistband or shirt. There is a safety strap you can buy for it in case it falls, but it's not a wristband.

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I need one I can wear while swimming
Related: Polar M200, Fitbit Charge 2, Fitness Trackers | Submitted by Nancy 24 days ago

Out of the 2 fitness trackers you listed , the Polar M200 would be the ideal choice because the Fitbit Charge 2 is only water resistant (splash proof). The Polar M200 can be submerged up to 30 meters.

I have personally used the Withings Activité Steel (now called Nokia Steel), which in addition to being fully waterproof, automatically detects lengths while swimming. It also has a more stylish design than other trackers, in my opinion. 

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how come I can't link the fitness tracker to my phone
Related: Lintelek Tracker Watch, Fitness Trackers | Submitted by anonymous 29 days ago

Make certain you have downloaded the appropriate app to link the device to your phone and make sure the device is fully charged before trying to sync. the first time. If the problem persists, you may want to contact the manufacturer directly. 

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need to set time and date, how do I do it please?
Related: Letscom Fitness Band, Willful Non-Bluetooth Bracelet, Fitness Trackers | Submitted by Carlos 40 days ago

The time you have on the letscom should change automatically with your phone after your tracker is paired with your LETSFIT app. It should automatically choose your correct timezone once you pair it. This also applies if you want to change the time format from 12-hour time to military time, change your phone time to the desired format, then synchronize.

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