Polar M430 is a GPS running watch with Polar’s proprietary optical heart rate monitoring technology that measures heart rate from the wrist. Polar M430 includes advanced training features for runners, such as Polar Fitness Test with wrist-based heart rate, Polar Running Program and personalized feedback. It also comes with 24/7 activity and sleep tracking. Polar M430 is fully waterproof and includes customizable sport profiles, vibrating alerts and smart notifications and up to 8 hours of battery life in training mode (up to 3 weeks with activity tracking). Polar M430 is a great companion for treadmill and indoor runners as well as it tracks pace and distance from wrist movements when GPS is not available.