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The Polar M400 GPS sports watch is a great piece of supportive technology, featuring a sporty design and lots of functions to analyse and enhance your performance. Track your pace, calories, distance, altitude and route with the built-in GPS that has a ‘Back to Start’ capability, making it simplier to find a way back to where you started your session. Using the Polar Flow mobile app and web service, and the Smart Coaching technology, you can see the detail of each training session and then plan targets and a workout diary. The watch can monitor your activity 24/7, report on sleep quality and duration, is waterproof up to 30m and has good memory and battery life.