A heart rate monitor, or HRM, is generally referred to as an electronic device that wirelessly transmit your heart rate data to a sports watch, bike computer, or other device. Heart rate monitors historically were thought of as a chest strap, but other technologies have emerged, such as wrist-based heart rate, commonly found now on most sports watches, and using the same technology, modular heart rate sensors that can be used on the temple while swimming or upper bicep (or even leg) while running or cycling.
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