Polar M400 GPS Smart Sports Watch 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 24/8 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