HRM technology

I have often wondered on the nature of the transmissions between the chest transmitter and the receiver of modern heart rate monitors. Does anyone know if these are microwave based?

The reason I ask is that I was wondering if there are any safety issues like many say there are with mobile phones. Obviously the power would be very low, but on the other hand the device is in direct electical contact with the chest.

I asked Polar this question but never got a response.

Thanks, Jerry

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