B06WV8NGTN POLAR H10 Heart Rate Monitor, Bluetooth HRM Chest Strap – iPhone & Android Compatible, Black

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BUILT-IN MEMORY: Heart rate monitor stores 1 heart rate training session. Perfect for sports and activities where a wrist unit would be difficult to use.
GoPro COMPATIBLE: Pair your H10 Polar heart rate sensor directly to the GoPro Hero 5 compatibility camera and overlay your heart rate data onto the recorded video.
UPDATEABLE FIRMWARE: Heart rate monitor contains firmware updates that enhance the functionality.
ENHANCED BATTERY LIFE: 400 hours of operation time on a user replaceable battery. Operating temperature – 10 °C to +50 °C / 14 °F to 122 °F
COMFORTABLE FIT: Revised heart rate chest strap design provides the comfort and security needed when exercising.