Show Description

This sleek GPS trainer and activity tracker lets you recruit your phone to your coaching team. With the Polar Flow mobile app and web service, you can plan, sync and share your training. Polar Flow guides you through your workout, telling you when to speed up and when to take it easy, and keeps you motivated with instant feedback. It lets you create tailored views for running, cycling and 20 more sports, so you only see the stats you want to focus on. Sport- specific algorithms estimate calories burned. If you’ve run a little too wild, the back-to-start feature uses an internal GPS to indicate a direct line route to your starting point. The running estimator calculates how long it’ll take you to complete the remaining distance at your current pace, excellent for timing workouts or plotting race tactics.

  • User configurable displays.
  • Automatic or manual laps, personal best, and interval timer modes.
  • Training benefit mode gives you feedback about your most recent workout right after the session.
  • Internal accelerometer complements the GPS to ensure accurate speed, distance and pace data.
  • 24/7 activity tracking can be turned on or off. Tracks steps, calories and sleep time, with notifications when you've been inactive for extended periods and options for hitting your desired activity levels.
  • Polar Flow web service and app allow you to monitor your training and analyze your progress, on the watch, on a smart device, or via web interface.
  • Web service creates tailored views for each sport, choose the data you'd like to see when you train, relive your routes and review and share highlights.
  • Polar Flow app uses Bluetooth Smart to set and sync targets, to guide your training with speed up/slow down prompts.
  • Get smart notifications through iOS devices (may require updates to M400 and Polar Flow app).
  • Compatible with iPhone 4s or higher, and Android 4.3 or higher, with Bluetooth 4.0.
  • Data transfer is compatible with iOS X 10.6, OS X 10.7, OS X 10.8, and later and PC Windows XP, Windows 7, Windows 8, and later.
  • Water resistant to 30m.
  • Battery life is 8 hours in GPS training mode, 30 days in activity tracking mode.
  • Includes M400 training computer, USB cable, and Getting Started Guide.

Tech specs

Show Tech specs
Ideal for
  • Running
  • Fitness and training
Wrist strap material Resin
IPX rating

Indicates the degree of protection against liquid. IP X1: Dripping water while in normal operating orientation; IP X4: Splashing water; IP X5: Water jets; IP X6: Powerful water jets; IP X7: Immersion up to 1m ≤ 30 minutes; IP X8: Suitable for submersion as specified by manufacturer.

Snooze Yes
Countdown timer Yes
Stopwatch Yes
Electronic compass

An electronic compass allows the user to view their heading in situations where they are either standing still or moving too slowly for the GPS to detect.

12/24 hour format Yes
Interface USB and Wireless
Low battery warning Yes
Calorie consumption

Calculated based on data from a heart rate monitor.

Add maps capability

These units allow you to add maps, so you can mark and name waypoints and create routes on your PC, and then upload the map of your choice to your GPS.

Programmable workouts

Want an easy jog? A fast-paced ride? A workout with lots of variety to keep you on your toes? With programmable workouts you can tailor your training to match whatever you are looking for on a particular day.

New lap auto start

Automatically triggers a new lap after reaching a specified difference.

Heart rate monitor Sold separately
Distance/time alarm Yes
Floats No
Interval training Yes
Bluetooth Yes
Auto pause

Automatically pauses timer when you stop or go below a specified pace.

Heart rate in real time

Displays beats per minute during activity.

Calories in real time

Displays calorie expenditure during activity, based on heart rate monitor data.

Speed/cadence sensor

Monitors pedalling cadence and measures pedalling strokes per minute.

Not compatible
Battery life 8 h
Chest strap Sold separately
Custom POI

A POI (point of interest) is a specific location that someone may find interesting (i.e., favourite viewpoint, best coffee stop before the trailhead). The custom POI feature allows the user to load only the POI's that interest them onto their GPS unit.

Metric/imperial units format Yes
Power meter

Displays output in watts as you ride.

Not compatible
Unit to unit transfer

Shares data wirelessly between compatible units.


A basic set of map data that is included with the GPS. Basemap detail may vary from unit to unit.

Area calculation No
Tide tables No
Battery power indicator Yes
Data card Not accepted
Foot pod

Attaches to your shoe, captures your running data (i.e., pace, distance), and transmits it to your heart rate monitor or GPS.

Sold separately
Touch screen No
Heart rate target zones

Displays heart rate zones during activity.

Barometric altimeter

Barometer function helps forecast weather trends. An altimeter can provide one line of position for location on a topo map, useful if the GPS isn't working.

Coded signal

A coded instrument ensures no interference between your chest strap and your watch, necessary if you are training in busy gyms or trails where other signals may be encountered.

Workout history Yes
Wireless sync to computer No
Button lock Yes
Batteries Rechargeable battery pack (non-removable)
Haptic feedback No
Virtual partner

Allows user to monitor training goals with either a virtual partner or alarms.

Pause timer

Pauses the timer when slowing or stopping, and automatically resumes when moving again.

Replaceable wrist strap Yes
Pace alarm

An alarm that notifies you if you vary from a pre-set pace.

ANT+ compatible

Ensures seamless digital wireless communication between ANT+ devices. For example, data from an ultra-low power wireless sensor can be displayed on a bike computer or smartphone, then downloaded to a PC, etc.

Made in China