Polar A300 Fitness Tracker and Activity Monitor ACTIVITY TRACKER: Waterproof fitness monitor motivates you to reach your daily goal by tracking your steps, distance, and calories burned 24/7 ADVANCED TECHNOLOGY: Vibrating inactivity alerts help you keep moving throughout the day SLEEP TRACKER: Automatically tracks your sleep time, quality of sleep, and sleep patterns COMPATIBLE: Compatible with H7 Heart Rate sensor for continuous, accurate heart rate CUSTOMIZE: Design your A300 fitness tracker to fit your style with interchangeable wrist bands in different colors