The Polar H9 is a high-quality heart rate sensor designed for everyday sports. It features the Polar Soft Strap for a comfortable fit and accurate heart rate tracking. The Polar H9 seamlessly integrates with the Polar Beat app and numerous third-party apps, transforming your phone into a fitness tracker. Its advanced Bluetooth, ANT+, and 5 kHz technologies ensure compatibility with a wide range of sports devices and gym equipment. The chest strap measurement provides instant feedback on your body's activity, delivering precise calorie burn data.