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The Polar M400 GPS is a sleek-looking, high-tech sports watch great for supporting and enhancing your training and performance. The built-in GPS tracks your pace, distance, calories and altitude and will give you a route back to your starting position. It is water resistant up to 30m and can save up to 30 hours of training information which can be synced with other devices and used with the Polar Flow mobile app and web service so that you can analyse your workouts and set goals and targets. It can also evaluate your body 24/7 including when not exercising and when sleeping, and when in this mode the battery will last up to 24 days.