Polar H9 Heart Rate Sensor (Black) XS-S

With the Polar H9 Heart Rate Monitor Chest Strap Black XS-S, you're assured of an accurate heart rate measurement during workouts. The included chest strap is suitable for a chest circumference between 52 and 73cm. The chest strap fits tightly around your chest, so you can measure your heart rate precisely. Despite the tight fit, you hardly feel this soft strap, so you can continue your workout without it being uncomfortable. You can connect the H9 heart rate sensor via Bluetooth to your smartphone, sports watch, or bike computer, for example. In addition, the sensor supports ANT+. This allows you to connect it to a fitness machine as well. This sensor is water-resistant up to a depth of 30m. This allows you to also accurately measure your heart rate while swimming.