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Polar M400 HR Running Watch - Black

Regular Price: £174.46

Special Price £129.82

Polar M400 is a waterproof GPS running watch and daily fitness tracker. It can help you plan optimal training, break your records, and even find your way back from a run.
Pair your phone with M400 and get alerts for incoming calls, received messages and push notifications from social media apps to your wrist and stay in the know wherever you are.


  • The M400 HR has a H7 heart rate sensor included!
  • Advanced GPS: The M400’s built-in GPS keeps track of your pace, distance and altitude
  • Activity Tracking: The M400 tracks your steps, activity, sleep and calories 24/7
  • Heart Rate Training: Heart rate training is one of the most effective training methods
  • Polar Flow: Plan, sync and share your training using the exclusive Polar Flow
  • Individual Targets: You can set your own individual training targets
  • Smart Notifications: See incoming calls and texts at a glance
  • Keep up to date: Read messages conveniently on the M400's display
  • Calendar Notifications: M400 alerts you about the appointments on your calendar
  • Receive push notifications from social media apps to your wrist
  • Weight: 56,6g
  • Thickness: 11,5 mm
  • Display size: 128 x 128 px high resolution
  • Integrated GPS with AssistNow™ satellite prediction technology
  • Waterproof 
  • Rechargeable 190 mAh lithium polymer battery
  • Battery duration up to 8 hours of training time with GPS and HR
  • Standard micro USB cable for data sync with PC or Mac
Model M400
SKU AS90051341-black
Barcode 725882013893
Color Black
Brand Polar
Analog/Digital Digital
Heart Rate Display Yes

Additional Information

Training Load

Shows you how your training affects your body and helps you compare the load of different sessions. Monitor your load continuously to recognise your personal limits and adjust training intensity and duration accordingly.

Recovery Status

Shows you the time necessary for recovery before the next training session.

Fitness Test

A five-minute test that measures aerobic fitness from your resting heart rate, heart rate variability and your background information. Complete the test regularly to see the progress you’re making.

Running Index

Shows how your running performance is developing.

Training Benefit

Delivers motivating feedback immediately after training describing the effect of the session.

Smart Calories

Lets you know exactly how many calories you’ve burned based on your weight, height, age, gender, your individual maximum heart rate (HRmax) and how hard you’re training.

Activity Guide

Shows how active you’ve been during the day and gives practical guidance for reaching your daily activity goal.

Activity Benefit

Gives feedback on your daily, weekly and monthly activity, showing how your active choices help you stay healthy.

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Customer Reviews

    • Polaruser
    • Recommend

    • By rating
    • 30 April 2016
    • Pros

      • Accurate hr
      • Great gps tracking
      • Quality


      • Not syncing with some fitness apps
      • Poss too many options?!
      Great fitness GPS watch. This is incredibly accurate and would have been a long term coat effective purchase if i hadn't run into difficulties synching with some fitness apps on my mobile. Perhaps polar hardware needs to be considered by app creators. Otherwise great product.
    • CharlieC
    • Great versatile watch easy to use lots of features

    • By rating
    • 13 February 2016
    • Pros

      • Range of sport options with customized data
      • Easy syncing with strava and other sites
      • Quick charge through usb in back of watch


      • None
      I wanted watch to track run and bike and heartrate. This watch does this simply and intuitively. Quickly locks onto GPS and heart monitor. Quickly syncs to download. USB in back is great and waterproof I wear it over clothing. Very happy with this watch you have to pay a lot more than £127 to get this functionality in most other watches.
    • Ryanmorris_
    • Really happy with this purchase

    • By rating
    • 9 February 2016
    • Pros

      • Comfortable strap
      • Easy to use/read interface
      • Polar Flow service; app and website are excellent


      • Strength of strap; having a replacement sent after only 2 weeks wear - hope it was just a faulty one off
      The M400 does everything I needed it to without the huge price limit. If you're a runner then I'd go with this model every time, and not the more expensive V800. Screen is easy to read whilst exercising and it also has a light or dark mode (daytime and nighttime). Strap is easy to wear and not restrictive at all.