POLAR H10 HEART RATE SENSOR (M-L)
When it comes to accuracy and connectivity, Polar H10 heart rate sensor is the go-to choice. Monitor your heart rate with maximum precision and connect your heart rate to a great variety of training devices with Bluetooth® and ANT+.
With a Polar H10, heart rate monitoring is more accurate and adaptable than ever.
More info - https://www.polar.com/uk-en/products/accessories/polar_h10_heart_rate_sensor