The Polar A370 is an attractive, sporty, waterproof fitness tracker that helps you stay in tune with your body around the clock through continuous heart rate monitoring, advanced sleep tracking, and Polar's unique training features. Discover how your heart responds to the ups and downs of your daily life. The Polar A370 wrist heart rate monitoring tracks your pulse 24/7, providing a complete overview of your daily activity. The Polar A370 shows you how many calories you have burned, your lowest and highest heart rates, and how your heart rate varies throughout the day. Sleep Plus offers valuable insights into your sleep patterns. It tracks the time, duration, and quality of your sleep, automatically detecting sleep interruptions. You can set your preferred sleep duration and rate your sleep, receiving feedback on your rest. Learn more about your sleep patterns and consider what you can do to optimize your nights. When you train outdoors, the Polar A370 uses your smartphone's GPS signal to measure speed and distance and track your route. With Polar A370's Smart Notifications, you stay updated even when you don't have time to check your smartphone. You receive notifications directly on your Polar A370 display for incoming calls, messages, or social media notifications, as well as calendar events. Training is easy and enjoyable thanks to wrist heart rate monitoring. The heart rate zones help you train with the right intensity. Polar's unique scientifically validated Smart Coaching features guide you through your workouts and provide motivating feedback.