Polar H10 heart rate sensor 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 wide variety of training devices with Bluetooth and ANT+. With Polar H10 heart rate monitoring is more accurate and adaptable than ever. Compatibility: iOS mobile devices: iPhone 5 and later with iOS 11 or later; Android mobile devices with Bluetooth 4.0 capability and Android 5.0 or later. Updates: Via mobile phone using Polar Beat app or Polar Flow app. Memory: One training session Battery type: CR 2025 Weight: Connector 21 g (0.74 oz) strap 39 g (1.38 oz) Battery life: 400 hours with BLE and 5 kHz transmission active